Arduino ZIF - Testing C64 PLAs

I designed a simple Arduino shield that has a 40-pin ZIF socket to provide easy access to ICs from the Arduino. I plan to use this as a testing harness for different ICs and to build support to program common EEPROMs or flash memory that I use. I think this is going to come in handy.

The first IC I am using in it is a Commodore 64 Programmable Logic Array (PLA) IC. I have a couple of C64s that apparently have bad PLAs. In this video, I test a known working PLA, a new GAL version of the PLA, and a couple of suspect PLAs pulled from C64s giving black screen output. (I have confirmed the results in an actual C64, too.)

EasyEDA source files, Gerber files, and starter Arduino sketch file available at x86/Arduino-ZIF at main · rehsd/x86 (

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