c64

In this blog post I am going to dive a bit deeper into the ezPLA chip, investigate the reason why it does not work in all C64 machines and then try to fix it.

A while back I made a prototype of a Commodore 64 PLA replacement chip in FPGA and covered this extensively in this blog post.

SIDKick is yet another SID replacement solution for your C64 that is powered by Teensy 4.1 board. It is completely free and open source based that you can build yourself.

What you see here is a Commodore 64 cartridge that I have created by sticking an EPROM and some other components on a breadboard.

A while back I also made a prototype for C64 PLA chip replacement, but I never did any further tests and completed the project. I thought that it was time to do some more tests on the chip. But will it pass the tests? Let's find out...

A while back I have bought a cheap second hand Commodore 64. Unfortunately it was broken, next to the PLA chip which I have fixed by binding a custom CPLD version of it, the BASIC ROM chip (901226-01) was also broken.

The most important chip in commodore 64 computer is the PLA chip. When this chip is broken, nothing will work and most certainly you will get a black screen after you try to turn it on.