rainisto/neatpla

Commodore 64 PLA replacement

PLA replacement circuit for Commodore 64. Based on dodgyPLA https://github.com/desaster/c64-dodgypla

I showed the design to some friends and they said "neat". Hence the name neatPLA :)

What is changed compared to dodgyPLA:

• 3.6V voltage regulator. Better for logic levels. Still within XC9536XL specs
• Cool looking PCB
• Changed pin mapping code to mach the new schematic & PCB.
• CASRAM delay increased to 30ns. Fixes timing issues with motherboard 326298
• Added extra delay to all outputs. Fixes a timing issue with motherboard 250425 + SwinSID

Now it is one of the most compatible PLA replacements.

This project includes:

• A Xilinx ISE project written in Verilog for Xilinx XC9536XL
• .jed file for programming the CPLD chip
• Gerber design files for ordering your own PCBs
• Schematic PDF

To be added:

• Bill of materials
• links to parts
• link to PCBway for PCB order

If you want a ready assembled PCB check my Amibay sales posts TBD. I charge 14€ + shipping for it.

Parts for DIY can be as low as 3$ per assembled board.