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Projects/MCL65+/SourceCode/Experimental/MCL65_A2Plus.ino

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//
//
// File Name : MCL65+.c
// Used on :
// Author : Ted Fried, MicroCore Labs
// Creation : 1/1/2021
//
// Description:
// ============
//
// MOS 6502 emulator with bus interface.
//
//------------------------------------------------------------------------
//
// Modification History:
// =====================
//
// Revision 1 1/1/2021
// Initial revision
//
//
//------------------------------------------------------------------------
//
// Copyright (c) 2021 Ted Fried
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
//
//------------------------------------------------------------------------
#include <stdint.h>
// Teensy 4.1 pin assignments
//
#define PIN_CLK0 24
#define PIN_RESET 40
#define PIN_READY_n 26
#define PIN_IRQ 25
#define PIN_NMI 41
#define PIN_RDWR_n 12
#define PIN_SYNC 39
#define PIN_ADDR0 27
#define PIN_ADDR1 38
#define PIN_ADDR2 28
#define PIN_ADDR3 37
#define PIN_ADDR4 29
#define PIN_ADDR5 36
#define PIN_ADDR6 30
#define PIN_ADDR7 35
#define PIN_ADDR8 31
#define PIN_ADDR9 34
#define PIN_ADDR10 32
#define PIN_ADDR11 33
#define PIN_ADDR12 1
#define PIN_ADDR13 0
#define PIN_ADDR14 2
#define PIN_ADDR15 23
#define PIN_DATAIN0 14
#define PIN_DATAIN1 15
#define PIN_DATAIN2 16
#define PIN_DATAIN3 17
#define PIN_DATAIN4 18
#define PIN_DATAIN5 19
#define PIN_DATAIN6 20
#define PIN_DATAIN7 21
#define PIN_DATAOUT0 11
#define PIN_DATAOUT1 10
#define PIN_DATAOUT2 9
#define PIN_DATAOUT3 8
#define PIN_DATAOUT4 7
#define PIN_DATAOUT5 6
#define PIN_DATAOUT6 5
#define PIN_DATAOUT7 4
#define PIN_DATAOUT_OE_n 3
// 6502 Flags
//
#define flag_n (register_flags & 0x80) >> 7 // register_flags[7]
#define flag_v (register_flags & 0x40) >> 6 // register_flags[6]
#define flag_b (register_flags & 0x10) >> 4 // register_flags[4]
#define flag_d (register_flags & 0x08) >> 3 // register_flags[3]
#define flag_i (register_flags & 0x04) >> 2 // register_flags[2]
#define flag_z (register_flags & 0x02) >> 1 // register_flags[1]
#define flag_c (register_flags & 0x01) >> 0 // register_flags[0]
// 6502 stack always in Page 1
//
#define register_sp_fixed (0x0100 | register_sp)
// CPU register for direct reads of the GPIOs
//
uint8_t register_flags=0x34;
uint8_t next_instruction;
uint8_t internal_memory_range=0;
uint8_t nmi_n_old=1;
uint8_t register_a=0;
uint8_t register_x=0;
uint8_t register_y=0;
uint8_t register_sp=0xFF;
uint8_t direct_datain=0;
uint8_t direct_reset=0;
uint8_t direct_ready_n=0;
uint8_t direct_irq=0;
uint8_t direct_nmi=0;
uint8_t assert_sync=0;
uint8_t global_temp=0;
uint8_t last_access_internal_RAM=0;
uint8_t rx_byte_state=0;
uint8_t mode=1;
uint8_t internal_RAM[65536];
uint8_t RAM_Bank1[65536];
uint8_t RAM_Bank2[65536];
uint16_t register_pc=0;
uint16_t current_address=0;
uint16_t effective_address=0;
uint16_t bank_switch_mode=0xC08A;
uint16_t local_address_old;
uint8_t AppleIIP_ROM_D0[0x0800]={ 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};
uint8_t AppleIIP_ROM_D8[0x0800]={ 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};
uint8_t AppleIIP_ROM_E0[0x0800]={ 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uint8_t AppleIIP_ROM_E8[0x0800]={ 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};
uint8_t AppleIIP_ROM_F0[0x0800]={ 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};
//uint8_t AppleIIP_ROM_F8[0x0800]={ 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};
uint8_t AppleIIP_ROM_F8[0x0800]={ 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0,0xfa };
// ------------------------------------------------------------------------------
// ------------------------------------------------------------------------------
// Setup Teensy 4.1 IO's
//
void setup() {
pinMode(PIN_CLK0, INPUT);
pinMode(PIN_RESET, INPUT);
pinMode(PIN_READY_n, INPUT);
pinMode(PIN_IRQ, INPUT);
pinMode(PIN_NMI, INPUT);
pinMode(PIN_RDWR_n, OUTPUT);
pinMode(PIN_SYNC, OUTPUT);
pinMode(PIN_ADDR0, OUTPUT);
pinMode(PIN_ADDR1, OUTPUT);
pinMode(PIN_ADDR2, OUTPUT);
pinMode(PIN_ADDR3, OUTPUT);
pinMode(PIN_ADDR4, OUTPUT);
pinMode(PIN_ADDR5, OUTPUT);
pinMode(PIN_ADDR6, OUTPUT);
pinMode(PIN_ADDR7, OUTPUT);
pinMode(PIN_ADDR8, OUTPUT);
pinMode(PIN_ADDR9, OUTPUT);
pinMode(PIN_ADDR10, OUTPUT);
pinMode(PIN_ADDR11, OUTPUT);
pinMode(PIN_ADDR12, OUTPUT);
pinMode(PIN_ADDR13, OUTPUT);
pinMode(PIN_ADDR14, OUTPUT);
pinMode(PIN_ADDR15, OUTPUT);
pinMode(PIN_DATAIN0, INPUT);
pinMode(PIN_DATAIN1, INPUT);
pinMode(PIN_DATAIN2, INPUT);
pinMode(PIN_DATAIN3, INPUT);
pinMode(PIN_DATAIN4, INPUT);
pinMode(PIN_DATAIN5, INPUT);
pinMode(PIN_DATAIN6, INPUT);
pinMode(PIN_DATAIN7, INPUT);
pinMode(PIN_DATAOUT0, OUTPUT);
pinMode(PIN_DATAOUT1, OUTPUT);
pinMode(PIN_DATAOUT2, OUTPUT);
pinMode(PIN_DATAOUT3, OUTPUT);
pinMode(PIN_DATAOUT4, OUTPUT);
pinMode(PIN_DATAOUT5, OUTPUT);
pinMode(PIN_DATAOUT6, OUTPUT);
pinMode(PIN_DATAOUT7, OUTPUT);
pinMode(PIN_DATAOUT_OE_n, OUTPUT);
for (uint32_t u=0; u<=0x07FF ; u++) { internal_RAM[0xD000+u] = AppleIIP_ROM_D0[u]; }
for (uint32_t u=0; u<=0x07FF ; u++) { internal_RAM[0xD800+u] = AppleIIP_ROM_D8[u]; }
for (uint32_t u=0; u<=0x07FF ; u++) { internal_RAM[0xE000+u] = AppleIIP_ROM_E0[u]; }
for (uint32_t u=0; u<=0x07FF ; u++) { internal_RAM[0xE800+u] = AppleIIP_ROM_E8[u]; }
for (uint32_t u=0; u<=0x07FF ; u++) { internal_RAM[0xF000+u] = AppleIIP_ROM_F0[u]; }
for (uint32_t u=0; u<=0x07FF ; u++) { internal_RAM[0xF800+u] = AppleIIP_ROM_F8[u]; }
}
// --------------------------------------------------------------------------------------------------
// --------------------------------------------------------------------------------------------------
//
// Begin 6502 Bus Interface Unit
//
// --------------------------------------------------------------------------------------------------
// --------------------------------------------------------------------------------------------------
// ----------------------------------------------------------
// Address range check
// Return: 0x0 - All exernal memory accesses
// 0x1 - Reads use cycle accurate internal memory and writes pass through to motherboard
// 0x2 - Reads accelerated using internal memory and writes pass through to motherboard
// 0x3 - All read and write accesses use accelerated internal memory
// ----------------------------------------------------------
inline uint8_t internal_address_check(int32_t local_address) {
if ( (local_address>=0x0000) && (local_address <0x0400)) return mode; // 6502 ZeroPage and Stack
if ( (local_address>=0x0400) && (local_address <0x0C00)) return 0x1; // Apple II Plus Text Page 1 and 2
if ( (local_address>=0x0C00) && (local_address <0x2000)) return mode; // Apple II Plus RAM
if ( (local_address>=0x2000) && (local_address <0x6000)) return 0x1; // Apple IIPlus HIRES Page 1 and 2
if ( (local_address>=0x6000) && (local_address <0xC000)) return mode; // Apple II Plus RAM
if ( (local_address>=0xD000) && (local_address <=0xFFFF)) return mode; // Apple II Plus ROM D0/D8, ROM E0/E8, ROM F0/F8
return 0x0;
}
// -------------------------------------------------
// Wait for the CLK1 rising edge and sample signals
// -------------------------------------------------
inline void wait_for_CLK_rising_edge() {
register uint32_t GPIO6_data=0;
register uint32_t GPIO6_data_d1=0;
uint32_t d10, d2, d3, d4, d5, d76;
while (((GPIO6_DR >> 12) & 0x1)!=0) {} // Teensy 4.1 Pin-24 GPIO6_DR[12] CLK
//while (((GPIO6_DR >> 12) & 0x1)==0) {GPIO6_data=GPIO6_DR;} // This method is ok for VIC-20 and Apple-II+ non-DRAM ranges
do { GPIO6_data_d1=GPIO6_DR; } while (((GPIO6_data_d1 >> 12) & 0x1)==0); // This method needed to support Apple-II+ DRAM read data setup time
GPIO6_data=GPIO6_data_d1;
d10 = (GPIO6_data&0x000C0000) >> 18; // Teensy 4.1 Pin-14 GPIO6_DR[19:18] D1:D0
d2 = (GPIO6_data&0x00800000) >> 21; // Teensy 4.1 Pin-16 GPIO6_DR[23] D2
d3 = (GPIO6_data&0x00400000) >> 19; // Teensy 4.1 Pin-17 GPIO6_DR[22] D3
d4 = (GPIO6_data&0x00020000) >> 13; // Teensy 4.1 Pin-18 GPIO6_DR[17] D4
d5 = (GPIO6_data&0x00010000) >> 11; // Teensy 4.1 Pin-19 GPIO6_DR[16] D5
d76 = (GPIO6_data&0x0C000000) >> 20; // Teensy 4.1 Pin-20 GPIO6_DR[27:26] D7:D6
direct_irq = (GPIO6_data&0x00002000) >> 13; // Teensy 4.1 Pin-25 GPIO6_DR[13] IRQ
direct_ready_n = (GPIO6_data&0x40000000) >> 30; // Teensy 4.1 Pin-26 GPIO6_DR[30] READY
direct_reset = (GPIO6_data&0x00100000) >> 20; // Teensy 4.1 Pin-40 GPIO6_DR[20] RESET
direct_nmi = (GPIO6_data&0x00200000) >> 21; // Teensy 4.1 Pin-41 GPIO6_DR[21] NMI
direct_datain = d76 | d5 | d4 | d3 | d2 | d10;
return;
}
// -------------------------------------------------
// Wait for the CLK1 falling edge
// -------------------------------------------------
inline void wait_for_CLK_falling_edge() {
while (((GPIO6_DR >> 12) & 0x1)==0) {} // Teensy 4.1 Pin-24 GPIO6_DR[12] CLK
while (((GPIO6_DR >> 12) & 0x1)!=0) {}
return;
}
// -------------------------------------------------
// Drive the 6502 Address pins
// -------------------------------------------------
inline void send_address(uint32_t local_address) {
register uint32_t writeback_data=0;
writeback_data = (0x6DFFFFF3 & GPIO6_DR); // Read in current GPIOx register value and clear the bits we intend to update
writeback_data = writeback_data | (local_address & 0x8000)<<10 ; // 6502_Address[15] TEENSY_PIN23 GPIO6_DR[25]
writeback_data = writeback_data | (local_address & 0x2000)>>10 ; // 6502_Address[13] TEENSY_PIN0 GPIO6_DR[3]
writeback_data = writeback_data | (local_address & 0x1000)>>10 ; // 6502_Address[12] TEENSY_PIN1 GPIO6_DR[2]
writeback_data = writeback_data | (local_address & 0x0002)<<27 ; // 6502_Address[1] TEENSY_PIN38 GPIO6_DR[28]
GPIO6_DR = writeback_data | (local_address & 0x0001)<<31 ; // 6502_Address[0] TEENSY_PIN27 GPIO6_DR[31]
writeback_data = (0xCFF3EFFF & GPIO7_DR); // Read in current GPIOx register value and clear the bits we intend to update
writeback_data = writeback_data | (local_address & 0x0400)<<2 ; // 6502_Address[10] TEENSY_PIN32 GPIO7_DR[12]
writeback_data = writeback_data | (local_address & 0x0200)<<20 ; // 6502_Address[9] TEENSY_PIN34 GPIO7_DR[29]
writeback_data = writeback_data | (local_address & 0x0080)<<21 ; // 6502_Address[7] TEENSY_PIN35 GPIO7_DR[28]
writeback_data = writeback_data | (local_address & 0x0020)<<13 ; // 6502_Address[5] TEENSY_PIN36 GPIO7_DR[18]
GPIO7_DR = writeback_data | (local_address & 0x0008)<<16 ; // 6502_Address[3] TEENSY_PIN37 GPIO7_DR[19]
writeback_data = (0xFF3BFFFF & GPIO8_DR); // Read in current GPIOx register value and clear the bits we intend to update
writeback_data = writeback_data | (local_address & 0x0100)<<14 ; // 6502_Address[8] TEENSY_PIN31 GPIO8_DR[22]
writeback_data = writeback_data | (local_address & 0x0040)<<17 ; // 6502_Address[6] TEENSY_PIN30 GPIO8_DR[23]
GPIO8_DR = writeback_data | (local_address & 0x0004)<<16 ; // 6502_Address[2] TEENSY_PIN28 GPIO8_DR[18]
writeback_data = (0x7FFFFF6F & GPIO9_DR); // Read in current GPIOx register value and clear the bits we intend to update
writeback_data = writeback_data | (local_address & 0x4000)>>10 ; // 6502_Address[14] TEENSY_PIN2 GPIO9_DR[4]
writeback_data = writeback_data | (local_address & 0x0800)>>4 ; // 6502_Address[11] TEENSY_PIN33 GPIO9_DR[7]
GPIO9_DR = writeback_data | (local_address & 0x0010)<<27 ; // 6502_Address[4] TEENSY_PIN29 GPIO9_DR[31]
return;
}
// ----------------------------------------------------------
// Read data from the microcontroller's interal RAM
// ----------------------------------------------------------
inline uint8_t Fetch_Internal_Memory(uint16_t local_address) {
if (( (bank_switch_mode==0xC080)||(bank_switch_mode==0xC083)) && (local_address>=0xD000) ) return RAM_Bank2[local_address];
else if (( (bank_switch_mode==0xC088)||(bank_switch_mode==0xC08B)) && (local_address>=0xD000) ) return RAM_Bank1[local_address];
else return internal_RAM[local_address];
}
// -------------------------------------------------
// Send the address for a read cyle
// -------------------------------------------------
inline void start_read(uint32_t local_address) {
current_address = local_address;
if (internal_address_check(current_address)>0x1) {
//last_access_internal_RAM=1;
}
else
{
if (last_access_internal_RAM==1) wait_for_CLK_rising_edge();
last_access_internal_RAM=0;
digitalWriteFast(PIN_RDWR_n, 0x1);
digitalWriteFast(PIN_SYNC, assert_sync);
send_address(local_address);
}
return;
}
// -------------------------------------------------
// On the rising CLK edge, read in the data
// -------------------------------------------------
inline uint8_t finish_read_byte() {
if (internal_address_check(current_address)>0x1) {
last_access_internal_RAM=1;
return (Fetch_Internal_Memory(current_address));
}
else
{
if (last_access_internal_RAM==1) wait_for_CLK_rising_edge();
last_access_internal_RAM=0;
digitalWriteFast(PIN_SYNC, 0x0);
do { wait_for_CLK_rising_edge(); } while (direct_ready_n == 0x1); // Delay a clock cycle until ready is active
if (internal_address_check(current_address)>0x0) { return (Fetch_Internal_Memory(current_address)); }
else { return direct_datain; }
}
}
// -------------------------------------------------
// Full read cycle with address and data read in
// -------------------------------------------------
inline uint8_t read_byte(uint16_t local_address) {
/*
switch (local_address) {
case 0xC080: bank_switch_mode = 0xC080; local_address_old=local_address; break;
case 0xC081: if (local_address_old == local_address) { bank_switch_mode = 0xC081;} local_address_old=local_address; break;
case 0xC082: bank_switch_mode = 0xC082; local_address_old=local_address; break;
case 0xC083: if (local_address_old == local_address) { bank_switch_mode = 0xC083;} local_address_old=local_address; break;
case 0xC088: bank_switch_mode = 0xC088; local_address_old=local_address; break;
case 0xC089: if (local_address_old == local_address){ bank_switch_mode = 0xC089;} local_address_old=local_address; break;
case 0xC08A: bank_switch_mode = 0xC08A; local_address_old=local_address; break;
case 0xC08B: if (local_address_old == local_address){ bank_switch_mode = 0xC08B;} local_address_old=local_address; break;
}
*/
switch (local_address) {
case 0xC080: bank_switch_mode = 0xC080; /* Serial.print("0 "); */ break;
case 0xC081: if (local_address_old == local_address) { bank_switch_mode = 0xC081;} local_address_old=local_address; /* Serial.print("1 "); */ break;
case 0xC082: bank_switch_mode = 0xC082; /* Serial.print("2 "); */ break;
case 0xC083: if (local_address_old == local_address) { bank_switch_mode = 0xC083;} local_address_old=local_address; /* Serial.print("3 "); */ break; // Change to specific eenables rathet than blanket code
case 0xC084: bank_switch_mode = 0xC080; /* Serial.print("4 "); */ break;
case 0xC085: if (local_address_old == local_address) { bank_switch_mode = 0xC081;} local_address_old=local_address; /* Serial.print("5 "); */ break;
case 0xC086: bank_switch_mode = 0xC082; /* Serial.print("6 "); */ break;
case 0xC087: if (local_address_old == local_address) { bank_switch_mode = 0xC083;} local_address_old=local_address; /* Serial.print("7 "); */ break;
case 0xC088: bank_switch_mode = 0xC088; /* Serial.print("8 "); */ break;
case 0xC089: if (local_address_old == local_address) { bank_switch_mode = 0xC089;} local_address_old=local_address; /* Serial.print("9 "); */ break;
case 0xC08a: bank_switch_mode = 0xC08a; /* Serial.print("a "); */ break;
case 0xC08b: if (local_address_old == local_address) { bank_switch_mode = 0xC08b;} local_address_old=local_address; /* Serial.print("b "); */ break;
case 0xC08c: bank_switch_mode = 0xC088; /* Serial.print("c "); */ break;
case 0xC08d: if (local_address_old == local_address) { bank_switch_mode = 0xC089;} local_address_old=local_address; /* Serial.print("d "); */ break;
case 0xC08e: bank_switch_mode = 0xC08a; /* Serial.print("e "); */ break;
case 0xC08f: if (local_address_old == local_address) { bank_switch_mode = 0xC08b;} local_address_old=local_address; /* Serial.print("f "); */ break;
}
if (internal_address_check(local_address)>0x1) {
last_access_internal_RAM=1;
return (Fetch_Internal_Memory(local_address));
}
else
{
if (last_access_internal_RAM==1) wait_for_CLK_rising_edge();
last_access_internal_RAM=0;
start_read(local_address);
do { wait_for_CLK_rising_edge(); } while (direct_ready_n == 0x1); // Delay a clock cycle until ready is active
if (local_address==0xC000) {
if (rx_byte_state==0 && direct_datain==0x88) rx_byte_state=1;
if (rx_byte_state==1 && direct_datain==0x95) rx_byte_state=2;
if (rx_byte_state==2 && direct_datain==0x88) rx_byte_state=3;
if (rx_byte_state==3) {
if (direct_datain==0xB0) { mode=0; rx_byte_state=0;}
if (direct_datain==0xB1) { mode=1; rx_byte_state=0;}
if (direct_datain==0xB2) { mode=2; rx_byte_state=0;}
if (direct_datain==0xB3) { mode=3; rx_byte_state=0;}
}
}
/*
// Support bank read registers
//
if (local_address==0xC011) {
if (bank_switch_mode>0xC083) direct_datain = 0x00; else direct_datain = 0xFF; // Bank
}
if (local_address==0xC012) {
if ( bank_switch_mode==0xC080 || bank_switch_mode==0xC083 || bank_switch_mode==0xC088 || bank_switch_mode==0xC08B ) direct_datain = 0xFF; else direct_datain = 0x00; // RAM
}
if (local_address==0xC016) direct_datain = 0x00;
*/
if (internal_address_check(current_address)>0x0) { return (Fetch_Internal_Memory(current_address)); }
else { return direct_datain; }
}
}
// -------------------------------------------------
// Full write cycle with address and data written
// -------------------------------------------------
inline void write_byte(uint16_t local_address , uint8_t local_write_data) {
// Always write to internal RAM
//
if (local_address < 0xC000) internal_RAM[local_address] = local_write_data;
else if ( ((bank_switch_mode==0xC081)||(bank_switch_mode==0xC083)) && (local_address>=0xD000) ) RAM_Bank2[local_address] = local_write_data;
else if ( ((bank_switch_mode==0xC089)||(bank_switch_mode==0xC08B)) && (local_address>=0xD000) ) RAM_Bank1[local_address] = local_write_data;
// Internal RAM
//
if (internal_address_check(local_address)>0x2) {
last_access_internal_RAM=1;
}
else
{
if (last_access_internal_RAM==1) wait_for_CLK_rising_edge();
last_access_internal_RAM=0;
digitalWriteFast(PIN_RDWR_n, 0x0);
digitalWriteFast(PIN_SYNC, 0x0);
send_address(local_address);
// Drive the data bus pins from the Teensy to the bus driver which is inactive
//
digitalWriteFast(PIN_DATAOUT0, (local_write_data & 0x01) );
digitalWriteFast(PIN_DATAOUT1, (local_write_data & 0x02)>>1 );
digitalWriteFast(PIN_DATAOUT2, (local_write_data & 0x04)>>2 );
digitalWriteFast(PIN_DATAOUT3, (local_write_data & 0x08)>>3 );
digitalWriteFast(PIN_DATAOUT4, (local_write_data & 0x10)>>4 );
digitalWriteFast(PIN_DATAOUT5, (local_write_data & 0x20)>>5 );
digitalWriteFast(PIN_DATAOUT6, (local_write_data & 0x40)>>6 );
digitalWriteFast(PIN_DATAOUT7, (local_write_data & 0x80)>>7 );
// During the second CLK phase, enable the data bus output drivers
//
wait_for_CLK_falling_edge();
digitalWriteFast(PIN_DATAOUT_OE_n, 0x0 );
wait_for_CLK_rising_edge();
digitalWriteFast(PIN_DATAOUT_OE_n, 0x1 );
}
return;
}
// --------------------------------------------------------------------------------------------------
// --------------------------------------------------------------------------------------------------
//
// End 6502 Bus Interface Unit
//
// --------------------------------------------------------------------------------------------------
// --------------------------------------------------------------------------------------------------
void push(uint8_t push_data) {
write_byte(register_sp_fixed, push_data);
register_sp = register_sp - 1;
return;
}
uint8_t pop() {
uint8_t temp=0;
register_sp = register_sp + 1;
temp = read_byte(register_sp_fixed);
return temp;
}
void Calc_Flags_NEGATIVE_ZERO(uint8_t local_data) {
if (0x80&local_data) register_flags = register_flags | 0x80; // Set the N flag
else register_flags = register_flags & 0x7F; // Clear the N flag
if (local_data==0) register_flags = register_flags | 0x02; // Set the Z flag
else register_flags = register_flags & 0xFD; // Clear the Z flag
return;
}
uint16_t Sign_Extend16(uint16_t reg_data) {
if ((reg_data&0x0080)== 0x0080) { return (reg_data | 0xFF00); }
else { return (reg_data & 0x00FF); }
}
void Begin_Fetch_Next_Opcode() {
register_pc++;
assert_sync=1;
start_read(register_pc);
return;
}
// -------------------------------------------------
// Addressing Modes
// -------------------------------------------------
uint8_t Fetch_Immediate() {
register_pc++;
return read_byte(register_pc);
}
uint8_t Fetch_ZeroPage() {
effective_address = Fetch_Immediate();
return read_byte(effective_address);
}
uint8_t Fetch_ZeroPage_X() {
uint16_t bal;
bal = Fetch_Immediate();
read_byte(register_pc+1);
effective_address = (0x00FF & (bal + register_x));
return read_byte(effective_address);
}
uint8_t Fetch_ZeroPage_Y() {
uint16_t bal;
bal = Fetch_Immediate();
read_byte(register_pc+1);
effective_address = (0x00FF & (bal + register_y));
return read_byte(effective_address);
}
uint16_t Calculate_Absolute() {
uint16_t adl, adh;
adl = Fetch_Immediate();
adh = Fetch_Immediate()<<8;
effective_address = adl + adh;
return effective_address;
}
uint8_t Fetch_Absolute() {
uint16_t adl, adh;
adl = Fetch_Immediate();
adh = Fetch_Immediate()<<8;
effective_address = adl + adh;
return read_byte(effective_address);
}
uint8_t Fetch_Absolute_X(uint8_t page_cross_check) {
uint16_t bal, bah;
uint8_t local_data;
bal = Fetch_Immediate();
bah = Fetch_Immediate()<<8;
effective_address = bah + bal + register_x;
local_data = read_byte(effective_address );
if ( page_cross_check==1 && ( (0xFF00&effective_address) != (0xFF00&bah) ) ) {
local_data = read_byte(effective_address );
}
return local_data;
}
uint8_t Fetch_Absolute_Y(uint8_t page_cross_check) {
uint16_t bal, bah;
uint8_t local_data;
bal = Fetch_Immediate();
bah = Fetch_Immediate()<<8;
effective_address = bah + bal + register_y;
local_data = read_byte(effective_address );
if ( page_cross_check==1 && ( (0xFF00&effective_address) != (0xFF00&bah) ) ) {
local_data = read_byte(effective_address );
}
return local_data;
}
uint8_t Fetch_Indexed_Indirect_X() {
uint16_t bal;
uint16_t adl, adh;
uint8_t local_data;
bal = Fetch_Immediate() + register_x;
read_byte(bal);
adl = read_byte(0xFF&bal);
adh = read_byte(0xFF&(bal+1)) << 8;
effective_address = adh + adl ;
local_data = read_byte(effective_address);
return local_data;
}
uint8_t Fetch_Indexed_Indirect_Y(uint8_t page_cross_check) {
uint16_t ial, bah, bal;
uint8_t local_data;
ial = Fetch_Immediate();
bal = read_byte(0xFF&ial);
bah = read_byte(0xFF&(ial+1)) << 8;
effective_address = bah + bal + register_y;
local_data = read_byte(effective_address);
if ( page_cross_check==1 && ((0xFF00&effective_address) != (0xFF00&bah)) ) {
local_data = read_byte(effective_address);
}
return local_data;
}
void Write_ZeroPage(uint8_t local_data) {
effective_address = Fetch_Immediate();
write_byte(effective_address , local_data);
return;
}
void Write_Absolute(uint8_t local_data) {
effective_address = Fetch_Immediate();
effective_address = (Fetch_Immediate() << 8) + effective_address;
write_byte(effective_address , local_data );
return;
}
void Write_ZeroPage_X(uint8_t local_data) {
effective_address = Fetch_Immediate();
read_byte(effective_address);
write_byte( (0x00FF&(effective_address + register_x)) , local_data );
return;
}
void Write_ZeroPage_Y(uint8_t local_data) {
effective_address = Fetch_Immediate();
read_byte(effective_address);
write_byte( (0x00FF&(effective_address + register_y)) , local_data );
return;
}
void Write_Absolute_X(uint8_t local_data) {
uint16_t bal,bah;
bal = Fetch_Immediate();
bah = Fetch_Immediate()<<8;
effective_address = bal + bah + register_x;
read_byte(effective_address);
write_byte(effective_address , local_data );
return;
}
void Write_Absolute_Y(uint8_t local_data) {
uint16_t bal,bah;
bal = Fetch_Immediate();
bah = Fetch_Immediate()<<8;
effective_address = bal + bah + register_y;
read_byte(effective_address);
if ( (0xFF00&effective_address) != (0xFF00&bah) ) {
read_byte(effective_address);
}
write_byte(effective_address , local_data );
return;
}
void Write_Indexed_Indirect_X(uint8_t local_data) {
uint16_t bal;
uint16_t adl, adh;
bal = Fetch_Immediate();
read_byte(bal);
adl = read_byte(0xFF&(bal+register_x));
adh = read_byte(0xFF&(bal+register_x+1)) << 8;
effective_address = adh + adl;
write_byte(effective_address , local_data );
return;
}
void Write_Indexed_Indirect_Y(uint8_t local_data) {
uint16_t ial;
uint16_t bal, bah;
ial = Fetch_Immediate();
bal = read_byte(ial);
bah = read_byte(ial+1)<<8;
effective_address = bah + bal + register_y;
read_byte(effective_address);
write_byte(effective_address , local_data );
return;
}
void Double_WriteBack(uint8_t local_data) {
write_byte(effective_address , local_data);
write_byte(effective_address , local_data);
return;
}
// -------------------------------------------------
// Reset sequence for the 6502
// -------------------------------------------------
void reset_sequence() {
uint16_t temp1, temp2;
while (digitalReadFast(PIN_RESET)!=0) {} // Stay here until RESET deasserts
digitalWriteFast(PIN_RDWR_n, 0x1);
digitalWriteFast(PIN_DATAOUT_OE_n, 0x1 );
temp1 = read_byte(register_pc); // Address ??
temp1 = read_byte(register_pc+1); // Address ?? + 1
temp1 = read_byte(register_sp_fixed); // Address SP
temp1 = read_byte(register_sp_fixed-1); // Address SP - 1
temp1 = read_byte(register_sp_fixed-2); // Address SP - 2
temp1 = read_byte(0xFFFC); // Fetch Vector PCL
temp2 = read_byte(0xFFFD); // Fetch Vector PCH
register_flags = 0x34; // Set the I and B flags
register_pc = (temp2<<8) | temp1;
assert_sync=1;
start_read(register_pc); // Fetch first opcode at vector PCH,PCL
return;
}
// -------------------------------------------------
// NMI Interrupt Processing
// -------------------------------------------------
void nmi_handler() {
uint16_t temp1, temp2;
wait_for_CLK_rising_edge(); // Begin processing on next CLK edge
register_flags = register_flags | 0x20; // Set the flag[5]
register_flags = register_flags & 0xEF; // Clear the B flag
read_byte(register_pc+1); // Fetch PC+1 (Discard)
push(register_pc>>8); // Push PCH
push(register_pc); // Push PCL
push(register_flags); // Push P
temp1 = read_byte(0xFFFA); // Fetch Vector PCL
temp2 = read_byte(0xFFFB); // Fetch Vector PCH
register_flags = register_flags | 0x34; // Set the I flag and restore the B flag
register_pc = (temp2<<8) | temp1;
assert_sync=1;
start_read(register_pc); // Fetch first opcode at vector PCH,PCL
return;
}
// -------------------------------------------------
// BRK & IRQ Interrupt Processing
// -------------------------------------------------
void irq_handler(uint8_t opcode_is_brk) {
uint16_t temp1, temp2;
wait_for_CLK_rising_edge(); // Begin processing on next CLK edge
register_flags = register_flags | 0x20; // Set the flag[5]
if (opcode_is_brk==1) register_flags = register_flags | 0x10; // Set the B flag
else register_flags = register_flags & 0xEF; // Clear the B flag
read_byte(register_pc+1); // Fetch PC+1 (Discard)
push(register_pc>>8); // Push PCH
push(register_pc); // Push PCL
push(register_flags); // Push P
temp1 = read_byte(0xFFFE); // Fetch Vector PCL
temp2 = read_byte(0xFFFF); // Fetch Vector PCH
register_flags = register_flags | 0x34; // Set the I flag and restore the B flag
register_pc = (temp2<<8) | temp1;
assert_sync=1;
start_read(register_pc); // Fetch first opcode at vector PCH,PCL
return;
}
// -------------------------------------------------
//
// 6502 Opcodes
//
// -------------------------------------------------
// -------------------------------------------------
// 0x0A - ASL A - Arithmetic Shift Left - Accumulator
// -------------------------------------------------
void opcode_0x0A() {
read_byte(register_pc);
Begin_Fetch_Next_Opcode();
if (0x80&register_a) register_flags = register_flags | 0x01; // Set the C flag
else register_flags = register_flags & 0xFE; // Clear the C flag
register_a = register_a << 1;
Calc_Flags_NEGATIVE_ZERO(register_a);
return;
}
// -------------------------------------------------
// 0x4A - LSR A - Logical Shift Right - Accumulator
// -------------------------------------------------
void opcode_0x4A() {
read_byte(register_pc);
Begin_Fetch_Next_Opcode();
if (0x01&register_a) register_flags = register_flags | 0x01; // Set the C flag
else register_flags = register_flags & 0xFE; // Clear the C flag
register_a = register_a >> 1;
Calc_Flags_NEGATIVE_ZERO(register_a);
return;
}
// -------------------------------------------------
// 0x6A - ROR A - Rotate Right - Accumulator
// -------------------------------------------------
void opcode_0x6A() {
uint8_t old_carry_flag=0;
read_byte(register_pc);
Begin_Fetch_Next_Opcode();
old_carry_flag = register_flags << 7; // Shift the old carry flag to bit[8] to be rotated in
if (0x01&register_a) register_flags = register_flags | 0x01; // Set the C flag
else register_flags = register_flags & 0xFE; // Clear the C flag
register_a = ( old_carry_flag | (register_a>>1) );
Calc_Flags_NEGATIVE_ZERO(register_a);
return;
}
// -------------------------------------------------
// 0x2A - ROL A - Rotate Left - Accumulator
// -------------------------------------------------
void opcode_0x2A() {
uint8_t old_carry_flag=0;
read_byte(register_pc);
Begin_Fetch_Next_Opcode();
old_carry_flag = 0x1 & register_flags; // Store the old carry flag to be rotated in
if (0x80&register_a) register_flags = register_flags | 0x01; // Set the C flag
else register_flags = register_flags & 0xFE; // Clear the C flag
register_a = (register_a<<1) | old_carry_flag;
Calc_Flags_NEGATIVE_ZERO(register_a);
return;
}
// -------------------------------------------------
// ADC
// -------------------------------------------------
void Calculate_ADC(uint16_t local_data) {
uint16_t total=0;
uint16_t bcd_low=0;
uint16_t bcd_high=0;
uint16_t bcd_total=0;
uint8_t operand0=0;
uint8_t operand1=0;
uint8_t result=0;
uint8_t low_carry=0;
uint8_t high_carry=0;
Begin_Fetch_Next_Opcode();
if ((flag_d)==1) {
bcd_low = (0x0F&register_a) + (0x0F&local_data) + (flag_c) ;
if (bcd_low>0x9) { low_carry=0x10; bcd_low = bcd_low - 0xA ; }
bcd_high = (0xF0&register_a) + (0xF0&local_data) + low_carry;
if (bcd_high>0x90) { high_carry=1; bcd_high = bcd_high - 0xA0 ; }
register_flags = register_flags & 0xFE; // Clear the C flag
if ((0x00FF&bcd_total) > 0x09) { bcd_total=bcd_total+0x010; bcd_total=bcd_total-0x0A; }
if (high_carry==1) { bcd_total=bcd_total-0xA0; register_flags = register_flags | 0x01; } // Set the C flag
else register_flags = register_flags & 0xFE; // Clear the C flag
total = (0xFF & (bcd_low + bcd_high));
}
else {
total = register_a + local_data + (flag_c);
if (total>255) register_flags = register_flags | 0x01; // Set the C flag
else register_flags = register_flags & 0xFE; // Clear the C flag
}
operand0 = (register_a & 0x80);
operand1 = (local_data & 0x80);
result = (total & 0x80);
if (operand0==0 && operand1==0 && result!=0) register_flags = register_flags | 0x40; // Set the V flag
else if (operand0!=0 && operand1!=0 && result==0) register_flags = register_flags | 0x40;
else register_flags = register_flags & 0xBF; // Clear the V flag
register_a = (0xFF & total);
Calc_Flags_NEGATIVE_ZERO(register_a);
return;
}
void opcode_0x69() { Calculate_ADC(Fetch_Immediate()); return; } // 0x69 - ADC - Immediate - Binary
void opcode_0x65() { Calculate_ADC(Fetch_ZeroPage()); return; } // 0x65 - ADC - ZeroPage
void opcode_0x75() { Calculate_ADC(Fetch_ZeroPage_X()); return; } // 0x75 - ADC - ZeroPage , X
void opcode_0x6D() { Calculate_ADC(Fetch_Absolute()); return; } // 0x6D - ADC - Absolute
void opcode_0x7D() { Calculate_ADC(Fetch_Absolute_X(1)); return; } // 0x7D - ADC - Absolute , X
void opcode_0x79() { Calculate_ADC(Fetch_Absolute_Y(1)); return; } // 0x79 - ADC - Absolute , Y
void opcode_0x61() { Calculate_ADC(Fetch_Indexed_Indirect_X()); return; } // 0x61 - ADC - Indexed Indirect X
void opcode_0x71() { Calculate_ADC(Fetch_Indexed_Indirect_Y(1)); return; } // 0x71 - ADC - Indirect Indexed Y
// -------------------------------------------------
// SBC
// -------------------------------------------------
void Calculate_SBC(uint16_t local_data) {
uint16_t total=0;
uint16_t bcd_low=0;
uint16_t bcd_high=0;
uint16_t bcd_total=0;
int16_t signed_total=0;
uint8_t operand0=0;
uint8_t operand1=0;
uint8_t result=0;
uint8_t flag_c_invert=0;
uint8_t low_carry=0;
uint8_t high_carry=0;
Begin_Fetch_Next_Opcode();
if (flag_c!=0) flag_c_invert=0; else flag_c_invert=1;
if ((flag_d)==1) {
bcd_low = (0x0F&register_a) - (0x0F&local_data) - flag_c_invert ;
if (bcd_low>0x9) { low_carry=0x10; bcd_low = bcd_low + 0xA ; }
bcd_high = (0xF0&register_a) - (0xF0&local_data) - low_carry;
if (bcd_high>0x90) { high_carry=1; bcd_high = bcd_high + 0xA0 ; }
register_flags = register_flags & 0xFE; // Clear the C flag
if ((0x00FF&bcd_total) > 0x09) { bcd_total=bcd_total+0x010; bcd_total=bcd_total-0x0A; }
if (high_carry==0) { bcd_total=bcd_total-0xA0; register_flags = register_flags | 0x01; } // Set the C flag
else register_flags = register_flags & 0xFE; // Clear the C flag
total = (0xFF & (bcd_low + bcd_high));
}
else {
total = register_a - local_data - flag_c_invert;
signed_total = (int16_t)register_a - (int16_t)(local_data ) - flag_c_invert;
if (signed_total>=0) register_flags = register_flags | 0x01; // Set the C flag
else register_flags = register_flags & 0xFE; // Clear the C flag
}
operand0 = (register_a & 0x80);
operand1 = (local_data & 0x80);
result = (total & 0x80);
if (operand0==0 && operand1!=0 && result!=0) register_flags = register_flags | 0x40; // Set the V flag
else if (operand0!=0 && operand1==0 && result==0) register_flags = register_flags | 0x40;
else register_flags = register_flags & 0xBF; // Clear the V flag
register_a = (0xFF & total);
Calc_Flags_NEGATIVE_ZERO(register_a);
return;
}
void opcode_0xE9() { Calculate_SBC(Fetch_Immediate()); return; } // 0xE9 - SBC - Immediate
void opcode_0xE5() { Calculate_SBC(Fetch_ZeroPage()); return; } // 0xE5 - SBC - ZeroPage
void opcode_0xF5() { Calculate_SBC(Fetch_ZeroPage_X()); return; } // 0xF5 - SBC - ZeroPage , X
void opcode_0xED() { Calculate_SBC(Fetch_Absolute()); return; } // 0xED - SBC - Absolute
void opcode_0xFD() { Calculate_SBC(Fetch_Absolute_X(1)); return; } // 0xFD - SBC - Absolute , X
void opcode_0xF9() { Calculate_SBC(Fetch_Absolute_Y(1)); return; } // 0xF9 - SBC - Absolute , Y
void opcode_0xE1() { Calculate_SBC(Fetch_Indexed_Indirect_X()); return; } // 0xE1 - SBC - Indexed Indirect X
void opcode_0xF1() { Calculate_SBC(Fetch_Indexed_Indirect_Y(1)); return; } // 0xF1 - SBC - Indirect Indexed Y
// -------------------------------------------------
// Flag set/resets and NOP
// -------------------------------------------------
void opcode_0xEA() { read_byte(register_pc+1); Begin_Fetch_Next_Opcode(); return; } // 0xEA - NOP
void opcode_0x18() { read_byte(register_pc+1); Begin_Fetch_Next_Opcode(); register_flags=register_flags&0xFE; return; } // 0x18 - CLC - Clear Carry Flag
void opcode_0xD8() { read_byte(register_pc+1); Begin_Fetch_Next_Opcode(); register_flags=register_flags&0xF7; return; } // 0xD8 - CLD - Clear Decimal Mode
void opcode_0x58() { read_byte(register_pc+1); Begin_Fetch_Next_Opcode(); register_flags=register_flags&0xFB; return; } // 0x58 - CLI - Clear Interrupt Flag
void opcode_0xB8() { read_byte(register_pc+1); Begin_Fetch_Next_Opcode(); register_flags=register_flags&0xBF; return; } // 0xB8 - CLV - Clear Overflow Flag
void opcode_0x38() { read_byte(register_pc+1); Begin_Fetch_Next_Opcode(); register_flags=register_flags|0x01; return; } // 0x38 - SEC - Set Carry Flag
void opcode_0x78() { read_byte(register_pc+1); Begin_Fetch_Next_Opcode(); register_flags=register_flags|0x04; return; } // 0x78 - SEI - Set Interrupt Flag
void opcode_0xF8() { read_byte(register_pc+1); Begin_Fetch_Next_Opcode(); register_flags=register_flags|0x08; return; } // 0xF8 - SED - Set Decimal Mode
// -------------------------------------------------
// Increment/Decrements
// -------------------------------------------------
void opcode_0xCA() { read_byte(register_pc+1); Begin_Fetch_Next_Opcode(); register_x=register_x-1; Calc_Flags_NEGATIVE_ZERO(register_x); return; } // 0xCA - DEX - Decrement X
void opcode_0x88() { read_byte(register_pc+1); Begin_Fetch_Next_Opcode(); register_y=register_y-1; Calc_Flags_NEGATIVE_ZERO(register_y); return; } // 0x88 - DEY - Decrement Y
void opcode_0xE8() { read_byte(register_pc+1); Begin_Fetch_Next_Opcode(); register_x=register_x+1; Calc_Flags_NEGATIVE_ZERO(register_x); return; } // 0xE8 - INX - Increment X
void opcode_0xC8() { read_byte(register_pc+1); Begin_Fetch_Next_Opcode(); register_y=register_y+1; Calc_Flags_NEGATIVE_ZERO(register_y); return; } // 0xC8 - INY - Increment Y
// -------------------------------------------------
// Transfers
// -------------------------------------------------
void opcode_0xAA() { read_byte(register_pc+1); Begin_Fetch_Next_Opcode(); register_x=register_a; Calc_Flags_NEGATIVE_ZERO(register_x); return; } // 0xAA - TAX - Transfer Accumulator to X
void opcode_0xA8() { read_byte(register_pc+1); Begin_Fetch_Next_Opcode(); register_y=register_a; Calc_Flags_NEGATIVE_ZERO(register_y); return; } // 0xA8 - TAY - Transfer Accumulator to Y
void opcode_0xBA() { read_byte(register_pc+1); Begin_Fetch_Next_Opcode(); register_x=register_sp; Calc_Flags_NEGATIVE_ZERO(register_x); return; } // 0xBA - TSX - Transfer Stack Pointer to X
void opcode_0x8A() { read_byte(register_pc+1); Begin_Fetch_Next_Opcode(); register_a=register_x; Calc_Flags_NEGATIVE_ZERO(register_a); return; } // 0x8A - TXA - Transfer X to Accumulator
void opcode_0x9A() { read_byte(register_pc+1); Begin_Fetch_Next_Opcode(); register_sp=register_x; return; } // 0x9A - TXS - Transfer X to Stack Pointer
void opcode_0x98() { read_byte(register_pc+1); Begin_Fetch_Next_Opcode(); register_a=register_y; Calc_Flags_NEGATIVE_ZERO(register_a); return; } // 0x98 - TYA - Transfer Y to Accumulator
// -------------------------------------------------
// PUSH/POP Flags and Accumulator
// -------------------------------------------------
void opcode_0x08() { read_byte(register_pc+1); push(register_flags|0x30); Begin_Fetch_Next_Opcode(); return; } // 0x08 - PHP - Push Flags to Stack
void opcode_0x48() { read_byte(register_pc+1); push(register_a); Begin_Fetch_Next_Opcode(); return; } // 0x48 - PHA - Push Accumulator to the stack
void opcode_0x28() { read_byte(register_pc+1); read_byte(register_sp_fixed); register_flags=(pop()|0x30); Begin_Fetch_Next_Opcode(); return; } // 0x28 - PLP - Pop Flags from Stack
void opcode_0x68() { read_byte(register_pc+1); read_byte(register_sp_fixed); register_a=pop(); Calc_Flags_NEGATIVE_ZERO(register_a); Begin_Fetch_Next_Opcode(); return; } // 0x68 - PLA - Pop Accumulator from Stack
// -------------------------------------------------
// AND
// -------------------------------------------------
void opcode_0x29() { register_a=register_a&(Fetch_Immediate()); Begin_Fetch_Next_Opcode(); Calc_Flags_NEGATIVE_ZERO(register_a); return; } // 0x29 - AND - Immediate
void opcode_0x25() { register_a=register_a&(Fetch_ZeroPage()); Begin_Fetch_Next_Opcode(); Calc_Flags_NEGATIVE_ZERO(register_a); return; } // 0x25 - AND - ZeroPage
void opcode_0x35() { register_a=register_a&(Fetch_ZeroPage_X()); Begin_Fetch_Next_Opcode(); Calc_Flags_NEGATIVE_ZERO(register_a); return; } // 0x35 - AND - ZeroPage , X
void opcode_0x2D() { register_a=register_a&(Fetch_Absolute()); Begin_Fetch_Next_Opcode(); Calc_Flags_NEGATIVE_ZERO(register_a); return; } // 0x2D - AND - Absolute
void opcode_0x3D() { register_a=register_a&(Fetch_Absolute_X(1)); Begin_Fetch_Next_Opcode(); Calc_Flags_NEGATIVE_ZERO(register_a); return; } // 0x3D - AND - Absolute , X
void opcode_0x39() { register_a=register_a&(Fetch_Absolute_Y(1)); Begin_Fetch_Next_Opcode(); Calc_Flags_NEGATIVE_ZERO(register_a); return; } // 0x19 - OR - Absolute , Y
void opcode_0x21() { register_a=register_a&(Fetch_Indexed_Indirect_X()); Begin_Fetch_Next_Opcode(); Calc_Flags_NEGATIVE_ZERO(register_a); return; } // 0x21 - AND - Indexed Indirect X
void opcode_0x31() { register_a=register_a&(Fetch_Indexed_Indirect_Y(1)); Begin_Fetch_Next_Opcode(); Calc_Flags_NEGATIVE_ZERO(register_a); return; } // 0x31 - AND - Indirect Indexed Y
// -------------------------------------------------
// ORA
// -------------------------------------------------
void opcode_0x09() { register_a=register_a|(Fetch_Immediate()); Begin_Fetch_Next_Opcode(); Calc_Flags_NEGATIVE_ZERO(register_a); return; } // 0x09 - OR - Immediate
void opcode_0x05() { register_a=register_a|(Fetch_ZeroPage()); Begin_Fetch_Next_Opcode(); Calc_Flags_NEGATIVE_ZERO(register_a); return; } // 0x05 - OR - ZeroPage
void opcode_0x15() { register_a=register_a|(Fetch_ZeroPage_X()); Begin_Fetch_Next_Opcode(); Calc_Flags_NEGATIVE_ZERO(register_a); return; } // 0x15 - OR - ZeroPage , X
void opcode_0x0D() { register_a=register_a|(Fetch_Absolute()); Begin_Fetch_Next_Opcode(); Calc_Flags_NEGATIVE_ZERO(register_a); return; } // 0x0D - OR - Absolute
void opcode_0x1D() { register_a=register_a|(Fetch_Absolute_X(1)); Begin_Fetch_Next_Opcode(); Calc_Flags_NEGATIVE_ZERO(register_a); return; } // 0x1D - OR - Absolute , X
void opcode_0x19() { register_a=register_a|(Fetch_Absolute_Y(1)); Begin_Fetch_Next_Opcode(); Calc_Flags_NEGATIVE_ZERO(register_a); return; } // 0x19 - OR - Absolute , Y
void opcode_0x01() { register_a=register_a|(Fetch_Indexed_Indirect_X()); Begin_Fetch_Next_Opcode(); Calc_Flags_NEGATIVE_ZERO(register_a); return; } // 0x01 - OR - Indexed Indirect X
void opcode_0x11() { register_a=register_a|(Fetch_Indexed_Indirect_Y(1)); Begin_Fetch_Next_Opcode(); Calc_Flags_NEGATIVE_ZERO(register_a); return; } // 0x11 - OR - Indirect Indexed Y
// -------------------------------------------------
// EOR
// -------------------------------------------------
void opcode_0x49() { register_a=register_a^(Fetch_Immediate()); Begin_Fetch_Next_Opcode(); Calc_Flags_NEGATIVE_ZERO(register_a); return; } // 0x49 - EOR - Immediate
void opcode_0x45() { register_a=register_a^(Fetch_ZeroPage()); Begin_Fetch_Next_Opcode(); Calc_Flags_NEGATIVE_ZERO(register_a); return; } // 0x45 - EOR - ZeroPage
void opcode_0x55() { register_a=register_a^(Fetch_ZeroPage_X()); Begin_Fetch_Next_Opcode(); Calc_Flags_NEGATIVE_ZERO(register_a); return; } // 0x55 - EOR - ZeroPage , X
void opcode_0x4D() { register_a=register_a^(Fetch_Absolute()); Begin_Fetch_Next_Opcode(); Calc_Flags_NEGATIVE_ZERO(register_a); return; } // 0x4D - EOR - Absolute
void opcode_0x5D() { register_a=register_a^(Fetch_Absolute_X(1)); Begin_Fetch_Next_Opcode(); Calc_Flags_NEGATIVE_ZERO(register_a); return; } // 0x5D - EOR - Absolute , X
void opcode_0x59() { register_a=register_a^(Fetch_Absolute_Y(1)); Begin_Fetch_Next_Opcode(); Calc_Flags_NEGATIVE_ZERO(register_a); return; } // 0x59 - EOR - Absolute , Y
void opcode_0x41() { register_a=register_a^(Fetch_Indexed_Indirect_X()); Begin_Fetch_Next_Opcode(); Calc_Flags_NEGATIVE_ZERO(register_a); return; } // 0x41 - EOR - Indexed Indirect X
void opcode_0x51() { register_a=register_a^(Fetch_Indexed_Indirect_Y(1)); Begin_Fetch_Next_Opcode(); Calc_Flags_NEGATIVE_ZERO(register_a); return; } // 0x51 - EOR - Indirect Indexed Y
// -------------------------------------------------
// LDA
// -------------------------------------------------
void opcode_0xA9() { register_a=Fetch_Immediate(); Begin_Fetch_Next_Opcode(); Calc_Flags_NEGATIVE_ZERO(register_a); return; } // 0xA9 - LDA - Immediate
void opcode_0xA5() { register_a=Fetch_ZeroPage(); Begin_Fetch_Next_Opcode(); Calc_Flags_NEGATIVE_ZERO(register_a); return; } // 0xA5 - LDA - ZeroPage
void opcode_0xB5() { register_a=Fetch_ZeroPage_X(); Begin_Fetch_Next_Opcode(); Calc_Flags_NEGATIVE_ZERO(register_a); return; } // 0xB5 - LDA - ZeroPage , X
void opcode_0xAD() { register_a=Fetch_Absolute(); Begin_Fetch_Next_Opcode(); Calc_Flags_NEGATIVE_ZERO(register_a); return; } // 0xAD - LDA - Absolute
void opcode_0xBD() { register_a=Fetch_Absolute_X(1); Begin_Fetch_Next_Opcode(); Calc_Flags_NEGATIVE_ZERO(register_a); return; } // 0xBD - LDA - Absolute , X
void opcode_0xB9() { register_a=Fetch_Absolute_Y(1); Begin_Fetch_Next_Opcode(); Calc_Flags_NEGATIVE_ZERO(register_a); return; } // 0xB9 - LDA - Absolute , Y
void opcode_0xA1() { register_a=Fetch_Indexed_Indirect_X(); Begin_Fetch_Next_Opcode(); Calc_Flags_NEGATIVE_ZERO(register_a); return; } // 0xA1 - LDA - Indexed Indirect X
void opcode_0xB1() { register_a=Fetch_Indexed_Indirect_Y(1); Begin_Fetch_Next_Opcode(); Calc_Flags_NEGATIVE_ZERO(register_a); return; } // 0xB1 - LDA - Indirect Indexed Y
// -------------------------------------------------
// LDX
// -------------------------------------------------
void opcode_0xA2() { register_x=Fetch_Immediate(); Begin_Fetch_Next_Opcode(); Calc_Flags_NEGATIVE_ZERO(register_x); return; } // 0xA2 - LDX - Immediate
void opcode_0xA6() { register_x=Fetch_ZeroPage(); Begin_Fetch_Next_Opcode(); Calc_Flags_NEGATIVE_ZERO(register_x); return; } // 0xA6 - LDX - ZeroPage
void opcode_0xB6() { register_x=Fetch_ZeroPage_Y(); Begin_Fetch_Next_Opcode(); Calc_Flags_NEGATIVE_ZERO(register_x); return; } // 0xB6 - LDX - ZeroPage , Y
void opcode_0xAE() { register_x=Fetch_Absolute(); Begin_Fetch_Next_Opcode(); Calc_Flags_NEGATIVE_ZERO(register_x); return; } // 0xAE - LDX - Absolute
void opcode_0xBE() { register_x=Fetch_Absolute_Y(1); Begin_Fetch_Next_Opcode(); Calc_Flags_NEGATIVE_ZERO(register_x); return; } // 0xBE - LDX - Absolute , Y
// -------------------------------------------------
// LDY
// -------------------------------------------------
void opcode_0xA0() { register_y=Fetch_Immediate(); Begin_Fetch_Next_Opcode(); Calc_Flags_NEGATIVE_ZERO(register_y);return; } // 0xA0 - LDY - Immediate
void opcode_0xA4() { register_y=Fetch_ZeroPage(); Begin_Fetch_Next_Opcode(); Calc_Flags_NEGATIVE_ZERO(register_y);return; } // 0xA4 - LDY - ZeroPage
void opcode_0xB4() { register_y=Fetch_ZeroPage_X(); Begin_Fetch_Next_Opcode(); Calc_Flags_NEGATIVE_ZERO(register_y);return; } // 0xB4 - LDY - ZeroPage , X
void opcode_0xAC() { register_y=Fetch_Absolute(); Begin_Fetch_Next_Opcode(); Calc_Flags_NEGATIVE_ZERO(register_y);return; } // 0xAC - LDY - Absolute
void opcode_0xBC() { register_y=Fetch_Absolute_X(1); Begin_Fetch_Next_Opcode(); Calc_Flags_NEGATIVE_ZERO(register_y);return; } // 0xBC - LDY - Absolute , X
// -------------------------------------------------
// BIT
// -------------------------------------------------
void Calculate_BIT(uint8_t local_data) {
uint8_t temp=0;
Begin_Fetch_Next_Opcode();
register_flags = (register_flags & 0x3F) | (local_data & 0xC0); // Copy fetched memory[7:6] to C,V flags
temp = local_data & register_a;
if (temp==0) register_flags = register_flags | 0x02; // Set the Z flag
else register_flags = register_flags & 0xFD; // Clear the Z flag
return;
}
void opcode_0x24() { Calculate_BIT(Fetch_ZeroPage()); return; } // 0x24 - BIT - ZeroPage
void opcode_0x2C() { Calculate_BIT(Fetch_Absolute()); return; } // 0x2C - BIT - Absolute
// -------------------------------------------------
// CMP
// -------------------------------------------------
void Calculate_CMP(uint8_t local_data) {
int16_t temp=0;
Begin_Fetch_Next_Opcode();
temp = register_a - local_data;
if (register_a >= local_data) register_flags = register_flags | 0x01; // Set the C flag
else register_flags = register_flags & 0xFE; // Clear the C flag
Calc_Flags_NEGATIVE_ZERO(temp);
return;
}
void opcode_0xC9() { Calculate_CMP(Fetch_Immediate()); return; } // 0xC9 - CMP - Immediate
void opcode_0xC5() { Calculate_CMP(Fetch_ZeroPage()); return; } // 0xC5 - CMP - ZeroPage
void opcode_0xD5() { Calculate_CMP(Fetch_ZeroPage_X()); return; } // 0xD5 - CMP - ZeroPage , X
void opcode_0xCD() { Calculate_CMP(Fetch_Absolute()); return; } // 0xCD - CMP - Absolute
void opcode_0xDD() { Calculate_CMP(Fetch_Absolute_X(1)); return; } // 0xDD - CMP - Absolute , X
void opcode_0xD9() { Calculate_CMP(Fetch_Absolute_Y(1)); return; } // 0xD9 - CMP - Absolute , Y
void opcode_0xC1() { Calculate_CMP(Fetch_Indexed_Indirect_X()); return; } // 0xC1 - CMP - Indexed Indirect X
void opcode_0xD1() { Calculate_CMP(Fetch_Indexed_Indirect_Y(1)); return; } // 0xD1 - CMP - Indirect Indexed Y
// -------------------------------------------------
// CPX
// -------------------------------------------------
void Calculate_CPX(uint8_t local_data) {
uint16_t temp=0;
Begin_Fetch_Next_Opcode();
temp = register_x - local_data;
if (register_x >= local_data) register_flags = register_flags | 0x01; // Set the C flag
else register_flags = register_flags & 0xFE; // Clear the C flag
Calc_Flags_NEGATIVE_ZERO(temp);
return;
}
void opcode_0xE0() { Calculate_CPX(Fetch_Immediate()); return; } // 0xE0 - CPX - Immediate
void opcode_0xE4() { Calculate_CPX(Fetch_ZeroPage()); return; } // 0xE4 - CPX - ZeroPage
void opcode_0xEC() { Calculate_CPX(Fetch_Absolute()); return; } // 0xEC - CPX - Absolute
// -------------------------------------------------
// CPY
// -------------------------------------------------
void Calculate_CPY(uint8_t local_data) {
uint16_t temp=0;
Begin_Fetch_Next_Opcode();
temp = register_y - local_data;
if (register_y >= local_data) register_flags = register_flags | 0x01; // Set the C flag
else register_flags = register_flags & 0xFE; // Clear the C flag
Calc_Flags_NEGATIVE_ZERO(temp);
return;
}
void opcode_0xC0() { Calculate_CPY(Fetch_Immediate()); return; } // 0xC0 - CPY - Immediate
void opcode_0xC4() { Calculate_CPY(Fetch_ZeroPage()); return; } // 0xC4 - CPY - ZeroPage
void opcode_0xCC() { Calculate_CPY(Fetch_Absolute()); return; } // 0xCC - CPY - Absolute
// -------------------------------------------------
// Store Operations
// -------------------------------------------------
void opcode_0x85() { Write_ZeroPage(register_a); Begin_Fetch_Next_Opcode(); return; } // 0x85 - STA - ZeroPage
void opcode_0x8D() { Write_Absolute(register_a); Begin_Fetch_Next_Opcode(); return; } // 0x8D - STA - Absolute
void opcode_0x95() { Write_ZeroPage_X(register_a); Begin_Fetch_Next_Opcode(); return; } // 0x95 - STA - ZeroPage , X
void opcode_0x9D() { Write_Absolute_X(register_a); Begin_Fetch_Next_Opcode(); return; } // 0x9D - STA - Absolute , X
void opcode_0x99() { Write_Absolute_Y(register_a); Begin_Fetch_Next_Opcode(); return; } // 0x99 - STA - Absolute , Y
void opcode_0x81() { Write_Indexed_Indirect_X(register_a); Begin_Fetch_Next_Opcode(); return; } // 0x81 - STA - Indexed Indirect X
void opcode_0x91() { Write_Indexed_Indirect_Y(register_a); Begin_Fetch_Next_Opcode(); return; } // 0x91 - STA - Indirect Indexed Y
void opcode_0x86() { Write_ZeroPage(register_x); Begin_Fetch_Next_Opcode(); return; } // 0x86 - STX - ZeroPage
void opcode_0x96() { Write_ZeroPage_Y(register_x); Begin_Fetch_Next_Opcode(); return; } // 0x96 - STX - ZeroPage , Y
void opcode_0x8E() { Write_Absolute(register_x); Begin_Fetch_Next_Opcode(); return; } // 0x8E - STX - Absolute
void opcode_0x84() { Write_ZeroPage(register_y); Begin_Fetch_Next_Opcode(); return; } // 0x84 - STY - ZeroPage
void opcode_0x94() { Write_ZeroPage_X(register_y); Begin_Fetch_Next_Opcode(); return; } // 0x94 - STY - ZeroPage , X
void opcode_0x8C() { Write_Absolute(register_y); Begin_Fetch_Next_Opcode(); return; } // 0x8C - STY - Absolute
// -------------------------------------------------
// ASL - Arithmetic Shift Left - Memory
// -------------------------------------------------
uint8_t Calculate_ASL(uint8_t local_data) {
if ((0x80&local_data)==0x80) register_flags = register_flags | 0x01; // Set the C flag
else register_flags = register_flags & 0xFE; // Clear the C flag
local_data = ((local_data << 1) & 0xFE);
Calc_Flags_NEGATIVE_ZERO(local_data);
return local_data;
}
// -------------------------------------------------
// ASL - Read-modify-write Operations
// -------------------------------------------------
void opcode_0x06() { Double_WriteBack(Calculate_ASL(Fetch_ZeroPage())); Begin_Fetch_Next_Opcode(); return; } // 0x06 - ASL - Arithmetic Shift Left - ZeroPage
void opcode_0x16() { Double_WriteBack(Calculate_ASL(Fetch_ZeroPage_X())); Begin_Fetch_Next_Opcode(); return; } // 0x16 - ASL - Arithmetic Shift Left - ZeroPage , X
void opcode_0x0E() { Double_WriteBack(Calculate_ASL(Fetch_Absolute())); Begin_Fetch_Next_Opcode(); return; } // 0x0E - ASL - Arithmetic Shift Left - Absolute
void opcode_0x1E() { Double_WriteBack(Calculate_ASL(Fetch_Absolute_X(0))); Begin_Fetch_Next_Opcode(); return; } // 0x1E - ASL - Arithmetic Shift Left - Absolute , X
// -------------------------------------------------
// INC - Memory
// -------------------------------------------------
uint8_t Calculate_INC(uint8_t local_data) {
local_data = local_data + 1;
global_temp = local_data;
Calc_Flags_NEGATIVE_ZERO(local_data);
return local_data;
}
void opcode_0xE6() { Double_WriteBack(Calculate_INC(Fetch_ZeroPage())); Begin_Fetch_Next_Opcode(); return; } // 0xE6 - INC - ZeroPage
void opcode_0xF6() { Double_WriteBack(Calculate_INC(Fetch_ZeroPage_X())); Begin_Fetch_Next_Opcode(); return; } // 0xF6 - INC - ZeroPage , X
void opcode_0xEE() { Double_WriteBack(Calculate_INC(Fetch_Absolute())); Begin_Fetch_Next_Opcode(); return; } // 0xEE - INC - Absolute
void opcode_0xFE() { Double_WriteBack(Calculate_INC(Fetch_Absolute_X(0))); Begin_Fetch_Next_Opcode(); return; } // 0xFE - INC - Absolute , X
// -------------------------------------------------
// DEC - Memory
// -------------------------------------------------
uint8_t Calculate_DEC(uint8_t local_data) {
local_data = local_data - 1;
global_temp = local_data;
Calc_Flags_NEGATIVE_ZERO(local_data);
return local_data;
}
void opcode_0xC6() { Double_WriteBack(Calculate_DEC(Fetch_ZeroPage())); Begin_Fetch_Next_Opcode(); return; } // 0xC6 - DEC - ZeroPage
void opcode_0xD6() { Double_WriteBack(Calculate_DEC(Fetch_ZeroPage_X())); Begin_Fetch_Next_Opcode(); return; } // 0xD6 - DEC - ZeroPage , X
void opcode_0xCE() { Double_WriteBack(Calculate_DEC(Fetch_Absolute())); Begin_Fetch_Next_Opcode(); return; } // 0xCE - DEC - Absolute
void opcode_0xDE() { Double_WriteBack(Calculate_DEC(Fetch_Absolute_X(0))); Begin_Fetch_Next_Opcode(); return; } // 0xDE - DEC - Absolute , X
// -------------------------------------------------
// LSR - Memory
// -------------------------------------------------
uint8_t Calculate_LSR(uint8_t local_data) {
if ((0x01&local_data)==0x01) register_flags = register_flags | 0x01; // Set the C flag
else register_flags = register_flags & 0xFE; // Clear the C flag
local_data = (0x7F& (local_data >> 1));
Calc_Flags_NEGATIVE_ZERO(local_data);
return local_data;
}
void opcode_0x46() { Double_WriteBack(Calculate_LSR(Fetch_ZeroPage())); Begin_Fetch_Next_Opcode(); return; } // 0x46 - LSR - Logical Shift Right - ZeroPage
void opcode_0x56() { Double_WriteBack(Calculate_LSR(Fetch_ZeroPage_X())); Begin_Fetch_Next_Opcode(); return; } // 0x56 - LSR - Logical Shift Right - ZeroPage , X
void opcode_0x4E() { Double_WriteBack(Calculate_LSR(Fetch_Absolute())); Begin_Fetch_Next_Opcode(); return; } // 0x4E - LSR - Logical Shift Right - Absolute
void opcode_0x5E() { Double_WriteBack(Calculate_LSR(Fetch_Absolute_X(0))); Begin_Fetch_Next_Opcode(); return; } // 0x5E - LSR - Logical Shift Right - Absolute , X
// -------------------------------------------------
// ROR - Memory
// -------------------------------------------------
uint8_t Calculate_ROR(uint8_t local_data) {
uint8_t old_carry_flag=0;
old_carry_flag = register_flags << 7; // Shift the old carry flag to bit[8] to be rotated in
if ((0x01&local_data)==0x01) register_flags = register_flags | 0x01; // Set the C flag
else register_flags = register_flags & 0xFE; // Clear the C flag
local_data = ( old_carry_flag | (local_data>>1) );
Calc_Flags_NEGATIVE_ZERO(local_data);
return local_data;
}
void opcode_0x66() { Double_WriteBack(Calculate_ROR(Fetch_ZeroPage())); Begin_Fetch_Next_Opcode(); return; } // 0x66 - ROR - Rotate Right - ZeroPage
void opcode_0x76() { Double_WriteBack(Calculate_ROR(Fetch_ZeroPage_X())); Begin_Fetch_Next_Opcode(); return; } // 0x76 - ROR - Rotate Right - ZeroPage , X
void opcode_0x6E() { Double_WriteBack(Calculate_ROR(Fetch_Absolute())); Begin_Fetch_Next_Opcode(); return; } // 0x6E - ROR - Rotate Right - Absolute
void opcode_0x7E() { Double_WriteBack(Calculate_ROR(Fetch_Absolute_X(0))); Begin_Fetch_Next_Opcode(); return; } // 0x7E - ROR - Rotate Right - Absolute , X
// -------------------------------------------------
// ROL - Memory
// -------------------------------------------------
uint8_t Calculate_ROL(uint8_t local_data) {
uint8_t old_carry_flag=0;
old_carry_flag = 0x1 & register_flags; // Store the old carry flag to be rotated in
if (0x80&local_data) register_flags = register_flags | 0x01; // Set the C flag
else register_flags = register_flags & 0xFE; // Clear the C flag
local_data = (local_data<<1) | old_carry_flag;
Calc_Flags_NEGATIVE_ZERO(local_data);
return local_data;
}
void opcode_0x26() { Double_WriteBack(Calculate_ROL(Fetch_ZeroPage())); Begin_Fetch_Next_Opcode(); return; } // 0x26 - ROL - Rotate Left - ZeroPage
void opcode_0x36() { Double_WriteBack(Calculate_ROL(Fetch_ZeroPage_X())); Begin_Fetch_Next_Opcode(); return; } // 0x36 - ROL - Rotate Left - ZeroPage , X
void opcode_0x2E() { Double_WriteBack(Calculate_ROL(Fetch_Absolute())); Begin_Fetch_Next_Opcode(); return; } // 0x2E - ROL - Rotate Left - Absolute
void opcode_0x3E() { Double_WriteBack(Calculate_ROL(Fetch_Absolute_X(0))); Begin_Fetch_Next_Opcode(); return; } // 0x3E - ROL - Rotate Left - Absolute , X
// -------------------------------------------------
// Branches
// -------------------------------------------------
void Branch_Taken() {
effective_address = Sign_Extend16(Fetch_Immediate());
effective_address = (register_pc+1) + effective_address;
if ( (0xFF00&register_pc) == (0xFF00&effective_address) ) { Fetch_Immediate(); } // Page boundary not crossed
else { Fetch_Immediate(); Fetch_Immediate(); } // Page boundary crossed
register_pc = effective_address;
assert_sync=1;
start_read(register_pc);
return;
}
void opcode_0xB0() { if ((flag_c)==1) Branch_Taken(); else { Fetch_Immediate(); Begin_Fetch_Next_Opcode();} return; } // 0xB0 - BCS - Branch on Carry Set
void opcode_0x90() { if ((flag_c)==0) Branch_Taken(); else { Fetch_Immediate(); Begin_Fetch_Next_Opcode();} return; } // 0x90 - BCC - Branch on Carry Clear
void opcode_0xF0() { if ((flag_z)==1) Branch_Taken(); else { Fetch_Immediate(); Begin_Fetch_Next_Opcode();} return; } // 0xF0 - BEQ - Branch on Zero Set
void opcode_0xD0() { if ((flag_z)==0) Branch_Taken(); else { Fetch_Immediate(); Begin_Fetch_Next_Opcode();} return; } // 0xD0 - BNE - Branch on Zero Clear
void opcode_0x70() { if ((flag_v)==1) Branch_Taken(); else { Fetch_Immediate(); Begin_Fetch_Next_Opcode();} return; } // 0x70 - BVS - Branch on Overflow Set
void opcode_0x50() { if ((flag_v)==0) Branch_Taken(); else { Fetch_Immediate(); Begin_Fetch_Next_Opcode();} return; } // 0x50 - BVC - Branch on Overflow Clear
void opcode_0x30() { if ((flag_n)==1) Branch_Taken(); else { Fetch_Immediate(); Begin_Fetch_Next_Opcode();} return; } // 0x30 - BMI - Branch on Minus (N Flag Set)
void opcode_0x10() { if ((flag_n)==0) Branch_Taken(); else { Fetch_Immediate(); Begin_Fetch_Next_Opcode();} return; } // 0x10 - BPL - Branch on Plus (N Flag Clear)
// -------------------------------------------------
// Jumps and Returns
// -------------------------------------------------
void opcode_0x4C() { register_pc=Calculate_Absolute(); assert_sync=1; start_read(register_pc); return; } // 0x4C - JMP - Jump Absolute
// -------------------------------------------------
// 0x6C - JMP - Jump Indirect
// -------------------------------------------------
void opcode_0x6C() {
uint16_t lal, lah;
uint16_t adl, adh;
lal = Fetch_Immediate();
lah = Fetch_Immediate()<<8;
adl = read_byte(lah + lal);
adh = read_byte(lah + lal + 1)<<8;
effective_address = adh+adl;
register_pc = (0xFF00&adh) + (0x00FF&effective_address) ; // 6502 page wrapping bug
assert_sync=1;
start_read(register_pc);
return ;
}
// -------------------------------------------------
// 0x20 - JSR - Jump to Subroutine
// -------------------------------------------------
void opcode_0x20() {
uint16_t adl, adh;
adl = Fetch_Immediate();
adh = Fetch_Immediate()<<8;
read_byte(register_sp_fixed);
push((0xFF00&register_pc)>>8);
push(0x00FF&register_pc);
register_pc = adh+adl;
assert_sync=1;
start_read(register_pc);
return ;
}
// -------------------------------------------------
// 0x40 - RTI - Return from Interrupt
// -------------------------------------------------
void opcode_0x40() {
uint16_t pcl, pch;
Fetch_Immediate();
read_byte(register_sp_fixed);
register_flags = pop();
pcl = pop();
pch = pop()<<8;
register_pc = pch+pcl;
assert_sync=1;
start_read(register_pc);
return ;
}
// -------------------------------------------------
// 0x60 - RTS - Return from Subroutine
// -------------------------------------------------
void opcode_0x60() {
uint16_t pcl, pch;
Fetch_Immediate();
read_byte(register_sp_fixed);
pcl = pop();
pch = pop()<<8;
register_pc = pch+pcl+1;
read_byte(register_pc);
assert_sync=1;
start_read(register_pc);
return ;
}
// -------------------------------------------------
//
// *** Undocumented 6502 Opcodes ***
//
// -------------------------------------------------
// --------------------------------------------------------------------------------------------------
// SLO - Shift left one bit in memory, then OR accumulator with memory.
// --------------------------------------------------------------------------------------------------
uint8_t Calculate_SLO(uint8_t local_data) {
if ((0x80&local_data)==0x80) register_flags = register_flags | 0x01; // Set the C flag
else register_flags = register_flags & 0xFE; // Clear the C flag
local_data = ((local_data << 1) & 0xFE);
register_a = register_a | local_data;
Calc_Flags_NEGATIVE_ZERO(register_a);
return local_data;
}
void opcode_0x07() { Double_WriteBack(Calculate_SLO(Fetch_ZeroPage())); Begin_Fetch_Next_Opcode(); return; } // 0x07 - SLO - ZeroPage
void opcode_0x17() { Double_WriteBack(Calculate_SLO(Fetch_ZeroPage_X())); Begin_Fetch_Next_Opcode(); return; } // 0x17 - SLO - ZeroPage , X
void opcode_0x03() { Double_WriteBack(Calculate_SLO(Fetch_Indexed_Indirect_X())); Begin_Fetch_Next_Opcode(); return; } // 0x03 - SLO - Indexed Indirect X
void opcode_0x13() { Double_WriteBack(Calculate_SLO(Fetch_Indexed_Indirect_Y(1))); Begin_Fetch_Next_Opcode(); return; } // 0x13 - SLO - Indirect Indexed Y
void opcode_0x0F() { Double_WriteBack(Calculate_SLO(Fetch_Absolute())); Begin_Fetch_Next_Opcode(); return; } // 0x0F - SLO - Absolute
void opcode_0x1F() { Double_WriteBack(Calculate_SLO(Fetch_Absolute_X(1))); Begin_Fetch_Next_Opcode(); return; } // 0x1F - SLO - Absolute , X
void opcode_0x1B() { Double_WriteBack(Calculate_SLO(Fetch_Absolute_Y(1))); Begin_Fetch_Next_Opcode(); return; } // 0x1B - SLO - Absolute , Y
// --------------------------------------------------------------------------------------------------
// RLA - Rotate one bit left in memory, then AND accumulator with memory.
// --------------------------------------------------------------------------------------------------
uint8_t Calculate_RLA(uint8_t local_data) {
uint8_t old_carry_flag=0;
old_carry_flag = 0x1 & register_flags; // Store the old carry flag to be rotated in
if (0x80&local_data) register_flags = register_flags | 0x01; // Set the C flag
else register_flags = register_flags & 0xFE; // Clear the C flag
local_data = (local_data<<1) | old_carry_flag;
register_a = register_a & local_data;
Calc_Flags_NEGATIVE_ZERO(register_a);
return local_data;
}
void opcode_0x27() { Double_WriteBack(Calculate_RLA(Fetch_ZeroPage())); Begin_Fetch_Next_Opcode(); return; } // 0x27 - RLA - ZeroPage
void opcode_0x37() { Double_WriteBack(Calculate_RLA(Fetch_ZeroPage_X())); Begin_Fetch_Next_Opcode(); return; } // 0x37 - RLA - ZeroPage , X
void opcode_0x23() { Double_WriteBack(Calculate_RLA(Fetch_Indexed_Indirect_X())); Begin_Fetch_Next_Opcode(); return; } // 0x23 - RLA - Indexed Indirect X
void opcode_0x33() { Double_WriteBack(Calculate_RLA(Fetch_Indexed_Indirect_Y(1))); Begin_Fetch_Next_Opcode(); return; } // 0x33 - RLA - Indirect Indexed Y
void opcode_0x2F() { Double_WriteBack(Calculate_RLA(Fetch_Absolute())); Begin_Fetch_Next_Opcode(); return; } // 0x2F - RLA - Absolute
void opcode_0x3F() { Double_WriteBack(Calculate_RLA(Fetch_Absolute_X(1))); Begin_Fetch_Next_Opcode(); return; } // 0x3F - RLA - Absolute , X
void opcode_0x3B() { Double_WriteBack(Calculate_RLA(Fetch_Absolute_Y(1))); Begin_Fetch_Next_Opcode(); return; } // 0x3B - RLA - Absolute , Y
// --------------------------------------------------------------------------------------------------
// SRE - Shift right one bit in memory, then EOR accumulator with memory.
// --------------------------------------------------------------------------------------------------
uint8_t Calculate_SRE(uint8_t local_data) {
if ((0x01&local_data)==0x01) register_flags = register_flags | 0x01; // Set the C flag
else register_flags = register_flags & 0xFE; // Clear the C flag
local_data = (0x7F& (local_data >> 1));
register_a = register_a ^ local_data;
Calc_Flags_NEGATIVE_ZERO(register_a);
return local_data;
}
void opcode_0x47() { Double_WriteBack(Calculate_SRE(Fetch_ZeroPage())); Begin_Fetch_Next_Opcode(); return; } // 0x47 - SRE - ZeroPage
void opcode_0x57() { Double_WriteBack(Calculate_SRE(Fetch_ZeroPage_X())); Begin_Fetch_Next_Opcode(); return; } // 0x57 - SRE - ZeroPage , X
void opcode_0x43() { Double_WriteBack(Calculate_SRE(Fetch_Indexed_Indirect_X())); Begin_Fetch_Next_Opcode(); return; } // 0x43 - SRE - Indexed Indirect X
void opcode_0x53() { Double_WriteBack(Calculate_SRE(Fetch_Indexed_Indirect_Y(1))); Begin_Fetch_Next_Opcode(); return; } // 0x53 - SRE - Indirect Indexed Y
void opcode_0x4F() { Double_WriteBack(Calculate_SRE(Fetch_Absolute())); Begin_Fetch_Next_Opcode(); return; } // 0x4F - SRE - Absolute
void opcode_0x5F() { Double_WriteBack(Calculate_SRE(Fetch_Absolute_X(1))); Begin_Fetch_Next_Opcode(); return; } // 0x5F - SRE - Absolute , X
void opcode_0x5B() { Double_WriteBack(Calculate_SRE(Fetch_Absolute_Y(1))); Begin_Fetch_Next_Opcode(); return; } // 0x5B - SRE - Absolute , Y
// --------------------------------------------------------------------------------------------------
// RRA - Rotate one bit right in memory, then add memory to accumulator (with carry).
// --------------------------------------------------------------------------------------------------
uint8_t Calculate_RRA(uint8_t local_data) {
if ((0x01&local_data)==0x01) register_flags = register_flags | 0x01; // Set the C flag
else register_flags = register_flags & 0xFE; // Clear the C flag
local_data = (0x7F& (local_data >> 1));
global_temp = local_data;
return local_data;
}
void opcode_0x67() { Double_WriteBack(Calculate_RRA(Fetch_ZeroPage())); Calculate_ADC(global_temp); return; } // 0x67 - RRA - ZeroPage
void opcode_0x77() { Double_WriteBack(Calculate_RRA(Fetch_ZeroPage_X())); Calculate_ADC(global_temp); return; } // 0x77 - RRA - ZeroPage , X
void opcode_0x63() { Double_WriteBack(Calculate_RRA(Fetch_Indexed_Indirect_X())); Calculate_ADC(global_temp); return; } // 0x63 - RRA - Indexed Indirect X
void opcode_0x73() { Double_WriteBack(Calculate_RRA(Fetch_Indexed_Indirect_Y(1))); Calculate_ADC(global_temp); return; } // 0x73 - RRA - Indirect Indexed Y
void opcode_0x6F() { Double_WriteBack(Calculate_RRA(Fetch_Absolute())); Calculate_ADC(global_temp); return; } // 0x6F - RRA - Absolute
void opcode_0x7F() { Double_WriteBack(Calculate_RRA(Fetch_Absolute_X(1))); Calculate_ADC(global_temp); return; } // 0x7F - RRA - Absolute , X
void opcode_0x7B() { Double_WriteBack(Calculate_RRA(Fetch_Absolute_Y(1))); Calculate_ADC(global_temp); return; } // 0x7B - RRA - Absolute , Y
// --------------------------------------------------------------------------------------------------
// AND the contents of the A and X registers (without changing the contents of either register) and
// stores the result in memory.
// --------------------------------------------------------------------------------------------------
void opcode_0x87() { Write_ZeroPage(register_a&register_x); Begin_Fetch_Next_Opcode(); return; } // 0x87 - SAX - ZeroPage
void opcode_0x97() { Write_ZeroPage_Y(register_a&register_x); Begin_Fetch_Next_Opcode(); return; } // 0x97 - SAX - ZeroPage , Y
void opcode_0x83() { Write_Indexed_Indirect_X(register_a&register_x); Begin_Fetch_Next_Opcode(); return; } // 0x83 - SAX - Indexed Indirect X
void opcode_0x8F() { Write_Absolute(register_a&register_x); Begin_Fetch_Next_Opcode(); return; } // 0x8F - SAX - Absolute
// --------------------------------------------------------------------------------------------------
// Load both the accumulator and the X register with the contents of a memory location.
// --------------------------------------------------------------------------------------------------
void opcode_0xA7() { register_a=Fetch_ZeroPage(); register_x=register_a; Begin_Fetch_Next_Opcode(); Calc_Flags_NEGATIVE_ZERO(register_a); return; } // 0xA7 - LAX - ZeroPage
void opcode_0xB7() { register_a=Fetch_ZeroPage_Y(); register_x=register_a; Begin_Fetch_Next_Opcode(); Calc_Flags_NEGATIVE_ZERO(register_a); return; } // 0xB7 - LAX - ZeroPage , Y
void opcode_0xA3() { register_a=Fetch_Indexed_Indirect_X(); register_x=register_a; Begin_Fetch_Next_Opcode(); Calc_Flags_NEGATIVE_ZERO(register_a); return; } // 0xA3 - LAX - Indexed Indirect X
void opcode_0xB3() { register_a=Fetch_Indexed_Indirect_Y(1); register_x=register_a; Begin_Fetch_Next_Opcode(); Calc_Flags_NEGATIVE_ZERO(register_a); return; } // 0xB3 - LAX - Indirect Indexed Y
void opcode_0xAF() { register_a=Fetch_Absolute(); register_x=register_a; Begin_Fetch_Next_Opcode(); Calc_Flags_NEGATIVE_ZERO(register_a); return; } // 0xAF - LAX - Absolute
void opcode_0xBF() { register_a=Fetch_Absolute_Y(1); register_x=register_a; Begin_Fetch_Next_Opcode(); Calc_Flags_NEGATIVE_ZERO(register_a); return; } // 0xBF - LAX - Absolute , Y
// --------------------------------------------------------------------------------------------------
// Decrement the contents of a memory location and then compare the result with the A register.
// --------------------------------------------------------------------------------------------------
void opcode_0xC7() { Double_WriteBack(Calculate_DEC(Fetch_ZeroPage())); Calculate_CMP(global_temp); return; } // 0xC7 - DCP - ZeroPage
void opcode_0xD7() { Double_WriteBack(Calculate_DEC(Fetch_ZeroPage_X())); Calculate_CMP(global_temp); return; } // 0xD7 - DCP - ZeroPage , X
void opcode_0xC3() { Double_WriteBack(Calculate_DEC(Fetch_Indexed_Indirect_X())); Calculate_CMP(global_temp); return; } // 0xC3 - DCP - Indexed Indirect X
void opcode_0xD3() { Double_WriteBack(Calculate_DEC(Fetch_Indexed_Indirect_Y(0))); Calculate_CMP(global_temp); return; } // 0xD3 - DCP - Indirect Indexed Y
void opcode_0xCF() { Double_WriteBack(Calculate_DEC(Fetch_Absolute())); Calculate_CMP(global_temp); return; } // 0xCF - DCP - Absolute
void opcode_0xDF() { Double_WriteBack(Calculate_DEC(Fetch_Absolute_X(0))); Calculate_CMP(global_temp); return; } // 0xDF - DCP - Absolute , X
void opcode_0xDB() { Double_WriteBack(Calculate_DEC(Fetch_Absolute_Y(0))); Calculate_CMP(global_temp); return; } // 0xDB - DCP - Absolute , Y
// --------------------------------------------------------------------------------------------------
// ISC - Increase memory by one, then subtract memory from accumulator (with borrow).
// --------------------------------------------------------------------------------------------------
void opcode_0xE7() { Double_WriteBack(Calculate_INC(Fetch_ZeroPage())); Calculate_SBC(global_temp); return; } // 0xE7 - ISC - ZeroPage
void opcode_0xF7() { Double_WriteBack(Calculate_INC(Fetch_ZeroPage_X())); Calculate_SBC(global_temp); return; } // 0xF7 - ISC - ZeroPage , X
void opcode_0xE3() { Double_WriteBack(Calculate_INC(Fetch_Indexed_Indirect_X())); Calculate_SBC(global_temp); return; } // 0xE3 - ISC - Indexed Indirect X
void opcode_0xF3() { Double_WriteBack(Calculate_INC(Fetch_Indexed_Indirect_Y(0))); Calculate_SBC(global_temp); return; } // 0xF3 - ISC - Indirect Indexed Y
void opcode_0xEF() { Double_WriteBack(Calculate_INC(Fetch_Absolute())); Calculate_SBC(global_temp); return; } // 0xEF - ISC - Absolute
void opcode_0xFF() { Double_WriteBack(Calculate_INC(Fetch_Absolute_X(0))); Calculate_SBC(global_temp); return; } // 0xFF - ISC - Absolute , X
void opcode_0xFB() { Double_WriteBack(Calculate_INC(Fetch_Absolute_Y(0))); Calculate_SBC(global_temp); return; } // 0xFB - ISC - Absolute , Y
// --------------------------------------------------------------------------------------------------
// ANC - ANDs the contents of the A register with an immediate value and then moves bit 7 of A
// into the Carry flag.
// --------------------------------------------------------------------------------------------------
void Calculate_ANC(uint8_t local_data) {
Begin_Fetch_Next_Opcode();
register_a = register_a & local_data;
if ((0x80&register_a)==0x80) register_flags = register_flags | 0x01; // Set the C flag
else register_flags = register_flags & 0xFE; // Clear the C flag
Calc_Flags_NEGATIVE_ZERO(register_a);
return;
}
void opcode_0x0B() { Calculate_ANC(Fetch_Immediate()); return; } // 0x0B - ANC - Immediate
void opcode_0x2B() { Calculate_ANC(Fetch_Immediate()); return; } // 0x2B - ANC - Immediate
// --------------------------------------------------------------------------------------------------
// ALR - AND the contents of the A register with an immediate value and then LSRs the result.
// --------------------------------------------------------------------------------------------------
void Calculate_ALR(uint8_t local_data) {
Begin_Fetch_Next_Opcode();
register_a = register_a & local_data;
if ((0x01&register_a)==0x01) register_flags = register_flags | 0x01; // Set the C flag
else register_flags = register_flags & 0xFE; // Clear the C flag
register_a = (0x7F& (register_a >> 1));
Calc_Flags_NEGATIVE_ZERO(register_a);
return;
}
void opcode_0x4B() { Calculate_ALR(Fetch_Immediate()); return; } // 0x4B - ALR - Immediate
// --------------------------------------------------------------------------------------------------
// ARR - ANDs the accumulator with an immediate value and then rotates the content right.
// --------------------------------------------------------------------------------------------------
void Calculate_ARR(uint8_t local_data) {
Begin_Fetch_Next_Opcode();
register_a = register_a & local_data;
register_a = (0x7F& (register_a >> 1));
register_flags = register_flags & 0xBE; // Pre-clear the C and V flags
if ( (0xC0 & register_a) == 0x40) { register_flags = register_flags | 0x40; } // Set the V flag
if ( (0xC0 & register_a) == 0x80) { register_flags = register_flags | 0x41; } // Set the C and V flags
if ( (0xC0 & register_a) == 0xC0) { register_flags = register_flags | 0x01; } // Set the C flag
Calc_Flags_NEGATIVE_ZERO(register_a);
return;
}
void opcode_0x6B() { Calculate_ARR(Fetch_Immediate()); return; } // 0x6B - ARR - Immediate
// --------------------------------------------------------------------------------------------------
// SBX - ANDs the contents of the A and X registers (leaving the contents of A intact),
// subtracts an immediate value, and then stores the result in X.
// --------------------------------------------------------------------------------------------------
void Calculate_SBX(uint16_t local_data) {
int16_t signed_total=0;
Begin_Fetch_Next_Opcode();
register_x = register_a & register_x;
register_x = register_x - local_data;
signed_total = (int16_t)register_x - (int16_t)(local_data );
if (signed_total>=0) register_flags = register_flags | 0x01; // Set the C flag
else register_flags = register_flags & 0xFE; // Clear the C flag
register_x = (0xFF & register_x);
Calc_Flags_NEGATIVE_ZERO(register_x);
return;
}
void opcode_0xCB() { Calculate_SBX(Fetch_Immediate()); return; } // 0xCB - SBX - Immediate
// --------------------------------------------------------------------------------------------------
// LAS - AND memory with stack pointer, transfer result to accumulator, X register and stack pointer.
// --------------------------------------------------------------------------------------------------
void opcode_0xBB() { register_sp=(register_sp&Fetch_Absolute_Y(1)); register_a=register_sp; register_x=register_sp; Begin_Fetch_Next_Opcode(); Calc_Flags_NEGATIVE_ZERO(register_a); return; } // 0xBB - LAS - Absolute , Y
// --------------------------------------------------------------------------------------------------
// NOP - Fetch Immediate
// --------------------------------------------------------------------------------------------------
void opcode_0x80() { Fetch_Immediate(); Begin_Fetch_Next_Opcode(); return; } // 0x80 - NOP - Immediate
void opcode_0x82() { Fetch_Immediate(); Begin_Fetch_Next_Opcode(); return; } // 0x82 - NOP - Immediate
void opcode_0xC2() { Fetch_Immediate(); Begin_Fetch_Next_Opcode(); return; } // 0xC2 - NOP - Immediate
void opcode_0xE2() { Fetch_Immediate(); Begin_Fetch_Next_Opcode(); return; } // 0xE2 - NOP - Immediate
void opcode_0x89() { Fetch_Immediate(); Begin_Fetch_Next_Opcode(); return; } // 0x89 - NOP - Immediate
// --------------------------------------------------------------------------------------------------
// NOP - Fetch ZeroPage
// --------------------------------------------------------------------------------------------------
void opcode_0x04() { Fetch_ZeroPage(); Begin_Fetch_Next_Opcode(); return; } // 0x04 - NOP - ZeroPage
void opcode_0x44() { Fetch_ZeroPage(); Begin_Fetch_Next_Opcode(); return; } // 0x44 - NOP - ZeroPage
void opcode_0x64() { Fetch_ZeroPage(); Begin_Fetch_Next_Opcode(); return; } // 0x64 - NOP - ZeroPage
// --------------------------------------------------------------------------------------------------
// NOP - Fetch ZeroPage , X
// --------------------------------------------------------------------------------------------------
void opcode_0x14() { Fetch_ZeroPage_X(); Begin_Fetch_Next_Opcode(); return; } // 0x14 - NOP - ZeroPage , X
void opcode_0x34() { Fetch_ZeroPage_X(); Begin_Fetch_Next_Opcode(); return; } // 0x34 - NOP - ZeroPage , X
void opcode_0x54() { Fetch_ZeroPage_X(); Begin_Fetch_Next_Opcode(); return; } // 0x54 - NOP - ZeroPage , X
void opcode_0x74() { Fetch_ZeroPage_X(); Begin_Fetch_Next_Opcode(); return; } // 0x74 - NOP - ZeroPage , X
void opcode_0xD4() { Fetch_ZeroPage_X(); Begin_Fetch_Next_Opcode(); return; } // 0xD4 - NOP - ZeroPage , X
void opcode_0xF4() { Fetch_ZeroPage_X(); Begin_Fetch_Next_Opcode(); return; } // 0xF4 - NOP - ZeroPage , X
// --------------------------------------------------------------------------------------------------
// NOP - Fetch Absolute
// --------------------------------------------------------------------------------------------------
void opcode_0x0C() { Fetch_Absolute(); Begin_Fetch_Next_Opcode(); return; } // 0x0C - NOP - Absolute
// --------------------------------------------------------------------------------------------------
// NOP - Fetch Absolute , X
// --------------------------------------------------------------------------------------------------
void opcode_0x1C() { Fetch_Absolute_X(1); Begin_Fetch_Next_Opcode(); return; } // 0x1C - NOP - Absolute , X
void opcode_0x3C() { Fetch_Absolute_X(1); Begin_Fetch_Next_Opcode(); return; } // 0x3C - NOP - Absolute , X
void opcode_0x5C() { Fetch_Absolute_X(1); Begin_Fetch_Next_Opcode(); return; } // 0x5C - NOP - Absolute , X
void opcode_0x7C() { Fetch_Absolute_X(1); Begin_Fetch_Next_Opcode(); return; } // 0x7C - NOP - Absolute , X
void opcode_0xDC() { Fetch_Absolute_X(1); Begin_Fetch_Next_Opcode(); return; } // 0xDC - NOP - Absolute , X
void opcode_0xFC() { Fetch_Absolute_X(1); Begin_Fetch_Next_Opcode(); return; } // 0xFC - NOP - Absolute , X
// --------------------------------------------------------------------------------------------------
// JAM - Lock up the processor
// --------------------------------------------------------------------------------------------------
void opcode_0x02() { Fetch_Immediate(); while (1) {} return; } // 0x02 - JAM
void opcode_0x12() { Fetch_Immediate(); while (1) {} return; } // 0x12 - JAM
void opcode_0x22() { Fetch_Immediate(); while (1) {} return; } // 0x22 - JAM
void opcode_0x32() { Fetch_Immediate(); while (1) {} return; } // 0x32 - JAM
void opcode_0x42() { Fetch_Immediate(); while (1) {} return; } // 0x42 - JAM
void opcode_0x52() { Fetch_Immediate(); while (1) {} return; } // 0x52 - JAM
void opcode_0x62() { Fetch_Immediate(); while (1) {} return; } // 0x62 - JAM
void opcode_0x72() { Fetch_Immediate(); while (1) {} return; } // 0x72 - JAM
void opcode_0x92() { Fetch_Immediate(); while (1) {} return; } // 0x92 - JAM
void opcode_0xB2() { Fetch_Immediate(); while (1) {} return; } // 0xB2 - JAM
void opcode_0xD2() { Fetch_Immediate(); while (1) {} return; } // 0xD2 - JAM
void opcode_0xF2() { Fetch_Immediate(); while (1) {} return; } // 0xF2 - JAM
// --------------------------------------------------------------------------------------------------
// Unstable 6502 opcodes
// --------------------------------------------------------------------------------------------------
void opcode_0x93() { Fetch_ZeroPage_Y(); Begin_Fetch_Next_Opcode(); return; } // 0x93 - SHA - ZeroPage , Y - Implelented here as a size 2 NOP
void opcode_0x9F() { Fetch_Absolute_Y(0); Begin_Fetch_Next_Opcode(); return; } // 0x9F - SHA - Absolute , Y - Implelented here as a size 3 NOP
void opcode_0x9E() { Fetch_Absolute_Y(0); Begin_Fetch_Next_Opcode(); return; } // 0x9E - SHX - Absolute , Y - Implelented here as a size 3 NOP
void opcode_0x9C() { Fetch_Absolute_X(0); Begin_Fetch_Next_Opcode(); return; } // 0x9C - SHY - Absolute , X - Implelented here as a size 3 NOP
void opcode_0x9B() { Fetch_Absolute_Y(0); Begin_Fetch_Next_Opcode(); return; } // 0x9B - TAS - Absolute , Y - Implelented here as a size 3 NOP
void opcode_0x8B() { Fetch_Immediate(); Begin_Fetch_Next_Opcode(); return; } // 0x8B - ANE - Immediate - Implelented here as a size 2 NOP
void opcode_0xAB() { Fetch_Immediate(); Begin_Fetch_Next_Opcode(); return; } // 0xAB - LAX - Immediate - Implelented here as a size 2 NOP
// --------------------------------------------------------------------------------------------------
// --------------------------------------------------------------------------------------------------
// -------------------------------------------------
//
// Main loop
//
// -------------------------------------------------
void loop() {
//setup();
// Give Teensy 4.1 a moment
delay (50);
wait_for_CLK_rising_edge();
wait_for_CLK_rising_edge();
wait_for_CLK_rising_edge();
reset_sequence();
while (1) {
if (direct_reset==1) reset_sequence();
// Poll for NMI and IRQ
//
if (nmi_n_old==0 && direct_nmi==1) nmi_handler();
nmi_n_old = direct_nmi;
if (direct_irq==0x1 && (flag_i)==0x0) irq_handler(0x0);
next_instruction = finish_read_byte();
assert_sync=0;
switch (next_instruction){
case 0x00: irq_handler(0x1); break; // BRK - Break
case 0x01: opcode_0x01(); break; // OR - Indexed Indirect X
case 0x02: opcode_0x02(); break; // JAM
case 0x03: opcode_0x03(); break; // SLO - Indexed Indirect X
case 0x04: opcode_0x04(); break; // NOP - ZeroPage
case 0x05: opcode_0x05(); break; // OR ZeroPage
case 0x06: opcode_0x06(); break; // ASL A - Arithmetic Shift Left - ZeroPage
case 0x07: opcode_0x07(); break; // SLO - ZeroPage
case 0x08: opcode_0x08(); break; // PHP - Push processor status to the stack
case 0x09: opcode_0x09(); break; // OR - Immediate
case 0x0A: opcode_0x0A(); break; // ASL A
case 0x0B: opcode_0x0B(); break; // ANC - Immediate
case 0x0C: opcode_0x0C(); break; // NOP - Absolute
case 0x0D: opcode_0x0D(); break; // OR - Absolute
case 0x0E: opcode_0x0E(); break; // ASL A - Arithmetic Shift Left - Absolute
case 0x0F: opcode_0x0F(); break; // SLO - Absolute
case 0x10: opcode_0x10(); break; // BNE - Branch on Zero Clear
case 0x11: opcode_0x11(); break; // OR Indirect Indexed Y
case 0x12: opcode_0x12(); break; // JAM
case 0x13: opcode_0x13(); break; // Indirect Indexed Y
case 0x14: opcode_0x14(); break; // NOP - ZeroPage , X
case 0x15: opcode_0x15(); break; // OR - ZeroPage,X
case 0x16: opcode_0x16(); break; // ASL A - Arithmetic Shift Left - ZeroPage , X
case 0x17: opcode_0x17(); break; // SLO - ZeroPage , X
case 0x18: opcode_0x18(); break; // CLC
case 0x19: opcode_0x19(); break; // OR - Absolute,Y
case 0x1A: opcode_0xEA(); break; // NOP
case 0x1B: opcode_0x1B(); break; // SLO - Absolute , Y
case 0x1C: opcode_0x1C(); break; // NOP - Absolute , X
case 0x1D: opcode_0x1D(); break; // OR - Absolute,X
case 0x1E: opcode_0x1E(); break; // ASL A - Arithmetic Shift Left - Absolute , X
case 0x1F: opcode_0x1F(); break; // SLO - Absolute , X
case 0x20: opcode_0x20(); break; // JSR - Jump to Subroutine
case 0x21: opcode_0x21(); break; // AND - Indexed Indirect
case 0x22: opcode_0x22(); break; // JAM
case 0x23: opcode_0x23(); break; // RLA - Indexed Indirect X
case 0x24: opcode_0x24(); break; // BIT - ZeroPage
case 0x25: opcode_0x25(); break; // AND - ZeroPage
case 0x26: opcode_0x26(); break; // ROL - Rotate Left - ZeroPage
case 0x27: opcode_0x27(); break; // RLA - ZeroPage
case 0x28: opcode_0x28(); break; // PLP - Pop processor status from the stack
case 0x29: opcode_0x29(); break; // AND - Immediate
case 0x2A: opcode_0x2A(); break; // ROL A
case 0x2B: opcode_0x2B(); break; // ANC - Immediate
case 0x2C: opcode_0x2C(); break; // BIT - Absolute
case 0x2D: opcode_0x2D(); break; // AND - Absolute
case 0x2E: opcode_0x2E(); break; // ROL - Rotate Left - Absolute
case 0x2F: opcode_0x2F(); break; // RLA - Absolute
case 0x30: opcode_0x30(); break; // BMI - Branch on Minus (N Flag Set)
case 0x31: opcode_0x31(); break; // AND - Indirect Indexed
case 0x32: opcode_0x32(); break; // JAM
case 0x33: opcode_0x33(); break; // RLA - Indirect Indexed Y
case 0x34: opcode_0x34(); break; // NOP - ZeroPage , X
case 0x35: opcode_0x35(); break; // AND - ZeroPage,X
case 0x36: opcode_0x36(); break; // ROL - Rotate Left - ZeroPage , X
case 0x37: opcode_0x37(); break; // RLA - ZeroPage , X
case 0x38: opcode_0x38(); break; // SEC
case 0x39: opcode_0x39(); break; // AND - Absolute,Y
case 0x3A: opcode_0xEA(); break; // NOP
case 0x3B: opcode_0x3B(); break; // RLA - Absolute , Y
case 0x3C: opcode_0x3C(); break; // NOP - Absolute , X
case 0x3D: opcode_0x3D(); break; // AND - Absolute,X
case 0x3E: opcode_0x3E(); break; // ROL - Rotate Left - Absolute , X
case 0x3F: opcode_0x3F(); break; // RLA - Absolute , X
case 0x40: opcode_0x40(); break; // RTI - Return from Interrupt
case 0x41: opcode_0x41(); break; // EOR - Indexed Indirect X
case 0x42: opcode_0x42(); break; // JAM
case 0x43: opcode_0x43(); break; // SRE - Indexed Indirect X
case 0x44: opcode_0x44(); break; // NOP - ZeroPage
case 0x45: opcode_0x45(); break; // EOR - ZeroPage
case 0x46: opcode_0x46(); break; // LSR - Logical Shift Right - ZeroPage
case 0x47: opcode_0x47(); break; // SRE - ZeroPage
case 0x48: opcode_0x48(); break; // PHA - Push Accumulator to the stack
case 0x49: opcode_0x49(); break; // EOR - Immediate
case 0x4A: opcode_0x4A(); break; // LSR A
case 0x4B: opcode_0x4B(); break; // ALR - Immediate
case 0x4C: opcode_0x4C(); break; // JMP - Jump Absolute
case 0x4D: opcode_0x4D(); break; // EOR - Absolute
case 0x4E: opcode_0x4E(); break; // LSR - Logical Shift Right - Absolute
case 0x4F: opcode_0x4F(); break; // SRE - Absolute
case 0x50: opcode_0x50(); break; // BVC - Branch on Overflow Clear
case 0x51: opcode_0x51(); break; // EOR - Indirect Indexed Y
case 0x52: opcode_0x52(); break; // JAM
case 0x53: opcode_0x53(); break; // SRE - Indirect Indexed Y
case 0x54: opcode_0x54(); break; // NOP - ZeroPage , X
case 0x55: opcode_0x55(); break; // EOR - ZeroPage,X
case 0x56: opcode_0x56(); break; // LSR - Logical Shift Right - ZeroPage , X
case 0x57: opcode_0x57(); break; // SRE - ZeroPage , X
case 0x58: opcode_0x58(); break; // CLI
case 0x59: opcode_0x59(); break; // EOR - Absolute,Y
case 0x5A: opcode_0xEA(); break; // NOP
case 0x5B: opcode_0x5B(); break; // RE - Absolute , Y
case 0x5C: opcode_0x5C(); break; // NOP - Absolute , X
case 0x5D: opcode_0x5D(); break; // EOR - Absolute,X
case 0x5E: opcode_0x5E(); break; // LSR - Logical Shift Right - Absolute , X
case 0x5F: opcode_0x5F(); break; // SRE - Absolute , X
case 0x60: opcode_0x60(); break; // RTS - Return from Subroutine
case 0x61: opcode_0x61(); break; // ADC - Indexed Indirect X
case 0x62: opcode_0x62(); break; // JAM
case 0x63: opcode_0x63(); break; // RRA - Indexed Indirect X
case 0x64: opcode_0x64(); break; // NOP - ZeroPage
case 0x65: opcode_0x65(); break; // ADC - ZeroPage
case 0x66: opcode_0x66(); break; // ROR - Rotate Right - ZeroPage
case 0x67: opcode_0x67(); break; // RRA - ZeroPage
case 0x68: opcode_0x68(); break; // PLA - Pop Accumulator from the stack
case 0x69: opcode_0x69(); break; // ADC - Immediate
case 0x6A: opcode_0x6A(); break; // ROR A
case 0x6B: opcode_0x6B(); break; // ARR - Immediate
case 0x6C: opcode_0x6C(); break; // JMP - Jump Indirect
case 0x6D: opcode_0x6D(); break; // ADC - Absolute
case 0x6E: opcode_0x6E(); break; // ROR - Rotate Right - Absolute
case 0x6F: opcode_0x6F(); break; // RRA - Absolute
case 0x70: opcode_0x70(); break; // BVS - Branch on Overflow Set
case 0x71: opcode_0x71(); break; // ADC - Indirect Indexed Y
case 0x72: opcode_0x72(); break; // JAM
case 0x73: opcode_0x73(); break; // RRA - Indirect Indexed Y
case 0x74: opcode_0x74(); break; // NOP - ZeroPage , X
case 0x75: opcode_0x75(); break; // ADC - ZeroPage , X
case 0x76: opcode_0x76(); break; // ROR - Rotate Right - ZeroPage , X
case 0x77: opcode_0x77(); break; // RRA - ZeroPage , X
case 0x78: opcode_0x78(); break; // SEI
case 0x79: opcode_0x79(); break; // ADC - Absolute , Y
case 0x7A: opcode_0xEA(); break; // NOP
case 0x7B: opcode_0x7B(); break; // RRA - Absolute , Y
case 0x7C: opcode_0x7C(); break; // NOP - Absolute , X
case 0x7D: opcode_0x7D(); break; // ADC - Absolute , X
case 0x7E: opcode_0x7E(); break; // ROR - Rotate Right - Absolute , X
case 0x7F: opcode_0x7F(); break; // RRA - Absolute , X
case 0x80: opcode_0x80(); break; // NOP - Immediate
case 0x81: opcode_0x81(); break; // STA - Indexed Indirect X
case 0x82: opcode_0x82(); break; // NOP - Immediate
case 0x83: opcode_0x83(); break; // SAX - Indexed Indirect X
case 0x84: opcode_0x84(); break; // STY - ZeroPage
case 0x85: opcode_0x85(); break; // STA - ZeroPage
case 0x86: opcode_0x86(); break; // STX - ZeroPage
case 0x87: opcode_0x87(); break; // SAX - ZeroPage
case 0x88: opcode_0x88(); break; // DEY
case 0x89: opcode_0x89(); break; // NOP - Immediate
case 0x8A: opcode_0x8A(); break; // TXA
case 0x8B: opcode_0x8B(); break; // ANE - Immediate
case 0x8C: opcode_0x8C(); break; // STY - Absolute
case 0x8D: opcode_0x8D(); break; // STA - Absolute
case 0x8E: opcode_0x8E(); break; // STX - Absolute
case 0x8F: opcode_0x8F(); break; // SAX - Absolute
case 0x90: opcode_0x90(); break; // BCC - Branch on Carry Clear
case 0x91: opcode_0x91(); break; // STA - Indirect Indexed Y
case 0x92: opcode_0x92(); break; // JAM
case 0x93: opcode_0x93(); break; // SHA - ZeroPage , Y
case 0x94: opcode_0x94(); break; // STY - ZeroPage , X
case 0x95: opcode_0x95(); break; // STA - ZeroPage , X
case 0x96: opcode_0x96(); break; // STX - ZeroPage , Y
case 0x97: opcode_0x97(); break; // SAX - ZeroPage , Y
case 0x98: opcode_0x98(); break; // TYA
case 0x99: opcode_0x99(); break; // STA - Absolute , Y
case 0x9A: opcode_0x9A(); break; // TXS
case 0x9B: opcode_0x9B(); break; // TAS - Absolute , Y
case 0x9C: opcode_0x9C(); break; // SHY - Absolute , X
case 0x9D: opcode_0x9D(); break; // STA - Absolute , X
case 0x9E: opcode_0x9E(); break; // SHX - Absolute , Y
case 0x9F: opcode_0x9F(); break; // SHA - Absolute , Y
case 0xA0: opcode_0xA0(); break; // LDY - Immediate
case 0xA1: opcode_0xA1(); break; // LDA - Indexed Indirect X
case 0xA2: opcode_0xA2(); break; // LDX - Immediate
case 0xA3: opcode_0xA3(); break; // LAX - Indexed Indirect X
case 0xA4: opcode_0xA4(); break; // LDY - ZeroPage
case 0xA5: opcode_0xA5(); break; // LDA - ZeroPage
case 0xA6: opcode_0xA6(); break; // LDX - ZeroPage
case 0xA7: opcode_0xA7(); break; // LAX - ZeroPage
case 0xA8: opcode_0xA8(); break; // TAY
case 0xA9: opcode_0xA9(); break; // LDA - Immediate
case 0xAA: opcode_0xAA(); break; // TAX
case 0xAB: opcode_0xAB(); break; // LAX - Immediate
case 0xAC: opcode_0xAC(); break; // LDY - Absolute
case 0xAD: opcode_0xAD(); break; // LDA - Absolute
case 0xAE: opcode_0xAE(); break; // LDX - Absolute
case 0xAF: opcode_0xAF(); break; // LAX - Absolute
case 0xB0: opcode_0xB0(); break; // BCS - Branch on Carry Set
case 0xB1: opcode_0xB1(); break; // LDA - Indirect Indexed Y
case 0xB2: opcode_0xB2(); break; // JAM
case 0xB3: opcode_0xB3(); break; // LAX - Indirect Indexed Y
case 0xB4: opcode_0xB4(); break; // LDY - ZeroPage , X
case 0xB5: opcode_0xB5(); break; // LDA - ZeroPage , X
case 0xB6: opcode_0xB6(); break; // LDX - ZeroPage , Y
case 0xB7: opcode_0xB7(); break; // LAX - ZeroPage , Y
case 0xB8: opcode_0xB8(); break; // CLV
case 0xB9: opcode_0xB9(); break; // LDA - Absolute , Y
case 0xBA: opcode_0xBA(); break; // TSX
case 0xBB: opcode_0xBB(); break; // LAS - Absolute , Y
case 0xBC: opcode_0xBC(); break; // LDY - Absolute , X
case 0xBD: opcode_0xBD(); break; // LDA - Absolute , X
case 0xBE: opcode_0xBE(); break; // LDX - Absolute , Y
case 0xBF: opcode_0xBF(); break; // LAX - Absolute , Y
case 0xC0: opcode_0xC0(); break; // CPY - Immediate
case 0xC1: opcode_0xC1(); break; // CMP - Indexed Indirect X
case 0xC2: opcode_0xC2(); break; // NOP - Immediate
case 0xC3: opcode_0xC3(); break; // DCP - Indexed Indirect X
case 0xC4: opcode_0xC4(); break; // CPY - ZeroPage
case 0xC5: opcode_0xC5(); break; // CMP - ZeroPage
case 0xC6: opcode_0xC6(); break; // DEC - ZeroPage
case 0xC7: opcode_0xC7(); break; // DCP - ZeroPage
case 0xC8: opcode_0xC8(); break; // INY
case 0xC9: opcode_0xC9(); break; // CMP - Immediate
case 0xCA: opcode_0xCA(); break; // DEX
case 0xCB: opcode_0xCB(); break; // SBX - Immediate
case 0xCC: opcode_0xCC(); break; // CPY - Absolute
case 0xCD: opcode_0xCD(); break; // CMP - Absolute
case 0xCE: opcode_0xCE(); break; // DEC - Absolute
case 0xCF: opcode_0xCF(); break; // DCP - Absolute
case 0xD0: opcode_0xD0(); break; // BNE - Branch on Zero Clear
case 0xD1: opcode_0xD1(); break; // CMP - Indirect Indexed Y
case 0xD2: opcode_0xD2(); break; // JAM
case 0xD3: opcode_0xD3(); break; // DCP - Indirect Indexed Y
case 0xD4: opcode_0xD4(); break; // NOP - ZeroPage , X
case 0xD5: opcode_0xD5(); break; // CMP - ZeroPage , X
case 0xD6: opcode_0xD6(); break; // DEC - ZeroPage , X
case 0xD7: opcode_0xD7(); break; // DCP - ZeroPage , X
case 0xD8: opcode_0xD8(); break; // CLD
case 0xD9: opcode_0xD9(); break; // CMP - Absolute , Y
case 0xDA: opcode_0xEA(); break; // NOP
case 0xDB: opcode_0xDB(); break; // DCP - Absolute , Y
case 0xDC: opcode_0xDC(); break; // NOP - Absolute , X
case 0xDD: opcode_0xDD(); break; // CMP - Absolute , X
case 0xDE: opcode_0xDE(); break; // DEC - Absolute , X
case 0xDF: opcode_0xDF(); break; // DCP - Absolute , X
case 0xE0: opcode_0xE0(); break; // CPX - Immediate
case 0xE1: opcode_0xE1(); break; // SBC - Indexed Indirect X
case 0xE2: opcode_0xE2(); break; // NOP - Immediate
case 0xE3: opcode_0xE3(); break; // ISC - Indexed Indirect X
case 0xE4: opcode_0xE4(); break; // CPX - ZeroPage
case 0xE5: opcode_0xE5(); break; // SBC - ZeroPage
case 0xE6: opcode_0xE6(); break; // INC - ZeroPage
case 0xE7: opcode_0xE7(); break; // ISC - ZeroPage
case 0xE8: opcode_0xE8(); break; // INX
case 0xE9: opcode_0xE9(); break; // SBC - Immediate
case 0xEA: opcode_0xEA(); break; // NOP
case 0xEB: opcode_0xE9(); break; // SBC - Immediate
case 0xEC: opcode_0xEC(); break; // CPX - Absolute
case 0xED: opcode_0xED(); break; // SBC - Absolute
case 0xEE: opcode_0xEE(); break; // INC - Absolute
case 0xEF: opcode_0xEF(); break; // ISC - Absolute
case 0xF0: opcode_0xF0(); break; // BEQ - Branch on Zero Set
case 0xF1: opcode_0xF1(); break; // SBC - Indirect Indexed Y
case 0xF2: opcode_0xF2(); break; // JAM
case 0xF3: opcode_0xF3(); break; // ISC - Indirect Indexed Y
case 0xF4: opcode_0xF4(); break; // NOP - ZeroPage , X
case 0xF5: opcode_0xF5(); break; // SBC - ZeroPage , X
case 0xF6: opcode_0xF6(); break; // INC - ZeroPage , X
case 0xF7: opcode_0xF7(); break; // ISC - ZeroPage , X
case 0xF8: opcode_0xF8(); break; // SED
case 0xF9: opcode_0xF9(); break; // SBC - Absolute , Y
case 0xFA: opcode_0xEA(); break; // NOP
case 0xFB: opcode_0xFB(); break; // ISC - Absolute , Y
case 0xFC: opcode_0xFC(); break; // NOP - Absolute , X
case 0xFD: opcode_0xFD(); break; // SBC - Absolute , X
case 0xFE: opcode_0xFE(); break; // INC - Absolute , X
case 0xFF: opcode_0xFF(); break; // ISC - Absolute , X
}
}
}
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