November 15th, 2021, marked the 50th anniversary of the release of the MCS-4 chipset. I figure this is as good a time as ever to update my MCS-4 project on OpenCores.
Here's a summary of the changes:
- Created subdirectories under rtl/verilog for each of the four initial MCS-4 chips.
- Moved the i4004 CPU-specific Verilog module files into the i4004 subdirectory.
- Updated the i4004 CPU Verilog modules with a few bugfixes.
- Published Verilog modules for the i4001 ROM, i4002 RAM, and i4003 Shift Register chips.
These are the Verilog sources I used in my Busicom 141-PF re-creation using a gutted Canon P170-DH calculator, so I'm pretty sure they work correctly.
Let me know if you find these files useful, or if you find what you think is a bug.
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License
