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.