EPROM-EMU-NG

History

Kris-Sekula 22411ded0f upadated version number to 1.8b in schematic		2020-11-18 21:02:05 -08:00
..
1.8b	upadated version number to 1.8b in schematic	2020-11-18 21:02:05 -08:00
1002_EPROM_EMU_NG	Updated PCB to version 1.6	2020-10-06 17:32:53 -07:00
BOM_1_6.csv	Added csv BOM	2020-10-06 16:26:44 -07:00
BOM_1_6.xlsx	updated BOM to version 1.6, added SIP socket for RNs and adjusted some parts to better fit the PCB	2020-10-06 14:47:22 -07:00
KiCad_1.7b.zip	1.7b not officially released yet	2020-10-28 10:00:06 -07:00
README.md	Update README.md	2020-11-18 20:45:16 -08:00

README.md

KiCad project files.

Version 1.8b: Fixed the footprint for Q1-2N4401 and Q2-2N4403, see Errata document for more details.

Version 1.8: I re-shuffled resistor networks, added RN3 to offer optional pull-up resistors for address line A0-A7, RN2 should be populated, RN1 and RN3 are optional. Added Q3 for my experiments, but there is no need to populate that transistor.

Version 1.7: Minor fix for a desing flaw as described in the ERRATA document. I also enlarged the holes for J1 as depeding on vendor of the connector in some cases the fit was very tight.

Version 1.6: Added some component description on silkscreen, no changes to tracks routing.

Version 1.4: I re-routed the power and improved the PCB design.

Version 1.0: After I built the first 5 prototypes, I discovered an issue with the PCB layout, one of the shift registers (U11) was getting onto a CMOS latch-up state, even though I had a few bypass caps around the PCB, I was still occasionally getting the issues. I fixed the prototypes by "bodging" a few connections at the bottom of the pcb.