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mgh80
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Update README.md

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Kris Sekula 2021-09-27 18:29:54 -07:00 committed by GitHub
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@ -16,16 +16,17 @@ Onboard address decoder:
A few solder jumpers allow disconnecting various onboard options (if you for example want to provide an external address decoder)... In the basic configuration you should link (with a solder blob) the following:
* JP1 - enable internal CLK source
* JP2 - enable internal ROM address decoder
* JP3 - enable internal RAM address decoder
* JP4 - enable internal IO(8255) address decoder
* JP2 - enable internal IO(8255) address decoder
* JP3 - enable internal ROM address decoder
* JP4 - enable internal RAM address decoder
* JP7 - set 8255 reset pin to GND (bypass R5)
* JP8 - enable onboard LED for port A0 on the 8255
Simple "blinky" program source (.asm) included and a compiled hex files (.hex) for 27C256 EPROM (or my EPROM emulator). It will toggle all lines of port B a few times a second.
Simple "blinky" program source (.asm) included and a compiled hex files (.hex) for 27C256 EPROM (or my EPROM emulator). It will toggle all lines of port A a few times a second.
Get your PCBs from [PCBWAY](https://www.pcbway.com/project/shareproject/mgh80___the_Arduino_of_the_80s__simple_z80_based__microcontroller____sbc_.html)
A few prototypes of HW1.0 are listed on [eBay](https://www.ebay.com/sch/avr4sale/m.html?_nkw=&_armrs=1&_ipg=&_from=)
A few component kits are listed on [eBay](https://www.ebay.com/sch/avr4sale/m.html?_nkw=&_armrs=1&_ipg=&_from=)
If you found this helpful and you like the work I do, why not buy me a coffee, thanks ! :)