Troubleshooting C64 PLA chip replacement
Channel: ezContents
Date: 2022-02-11

Troubleshooting C64 PLA chip replacement (ezPLA) using an Arduino logic tester and logic analyzer.
Video is sponsored by ​PCBWay: https://pcbway.com

This video shows the process of troubleshooting a PLA replacement retro chip (ezPLA) by first checking the logic table using an Arduino tester and then diving deeper to solve the problem with a logic analyzer.

Arduino PLA logic tester:
https://github.com/marekl123/ArduinoPLATester

Video contents:

0:00 Introduction
0:51 Video summary
1:12 First attempts
1:37 Explaining 74HC595
2:13 Arduino logic tester on a breadboard
4:13 C64 PLA dissected
5:19 74HC595 circuit explained
6.23 Explaining Arduino code
10:28 Testing ezPLA and PLA chip using the Arduino circuit
11:40 Timing of PLA chip explained
12:49 Connecting logic analyzer for further tests
14:14 Fixing the delay problem of ezPLA
16:17 Testing inside Commodore 64
16:35 Next steps

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