The LinuxJedi blog looks at restoring an Atari 800XL:
My Atari 800XL came boxed with a boxed disk drive, boxed tape drive and a second tape drive in the XE styling that was unboxed.
I didn’t immediately trust the PSU that came with the Atari, instead I decided to use a USB cable to power it. The 800XL only requires 5v at a low current, a USB power supply is plenty. I also used a SCART cable for video connected to an OSSC.
I have a really cool device called a BackBit Chip Tester Pro V2. This is cool because not only will it test basic logic and RAM chips from retro machines, it will also test custom logic chips from Atari and Commodore machines. I’ve used it to test Amiga custom chips before. The developers are very responsive to feedback too, they have added Amiga RTC chip support in a firmware update recently after I discussed this with them.
Anyway, I popped out the custom chips one by one and tested them. I very soon found the culprit.
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