Atari 65XE 320k RAM Expansion Troubleshooting

I'm troubleshooting the 320k RAM expansion I put in my Atari 65XE in one of the previous videos. It's quite the journey. My previous RAM expansion video (installing the mod): https://youtu.be/GtpmzixF97c The Retro Channel (successfully) installing the RAM expansion: https://youtu.be/Ah4gezAUWwU Extended RAM test download: https://atari.fox-1.nl/atari-400-800-xl-xe/400-800-xl-xe-tools/extended-ram-test-0-21-0/ TL866 EPROM programmer*: US: https://amzn.to/3tyvK3b UK: https://amzn.to/3IXETsE DE: https://amzn.to/3twUU22 TIME STAMPS: 0:00 Introduction 1:37 Possible Problems 5:17 Testing the Logic IC 6:34 Reprogramming another GAL 8:22 Trying another Logic IC 9:21 Double Checking the Wiring 12:07 Trying the new GAL 14:05 Trying different RAM 15:37 RAM Expansion switched off 15:57 Scoping the Signals 18:09 Jürgen's Ideas 20:05 Known-good Chips 23:13 Replacing original 4164 RAM 26:02 Replacing Sally CPU 28:32 Replacing the GTIA 29:52 Trying some Software 35:31 Potential remaining Problems 36:34 Thank you & Good night ----------------------------------------­------ MUSIC by FOCUS 10 https://focus10music.bandcamp.com EQUIPMENT AND TOOLS I USE: https://kit.co/janbeta * MERCHANDISE: https://janbeta.creator-spring.com TWITTER: https://twitter.com/thejanbeta PATREON: https://patreon.com/janbeta KO-FI: https://ko-fi.com/janbeta WEBSITE: https://www.janbeta.net TWITCH: https://www.twitch.tv/thejanbeta YT CHANNEL MEMBERSHIP: https://www.youtube.com/channel/UCftUpOO4h9EgH0eDOZtjzcA/join Thanks for watching! * Stuff marked with "*" contains affiliate links. You don't pay anything extra and I get a little commission from everything you buy through the links (even if you buy something different there). #JanBeta #Atari #RAMExpansion #Atari8bit