Andrew (LinuxJedi) HutchingsAug 3, 2023
Simultaneously repairing 2x #Amiga 4000s. 3D design / printing, Varta damage, dirt, etc... This series will have it all!
https://linuxjedi.co.uk/2023/08/03/amiga-4000-restoration-x2-part-1/
Amiga 4000 Restoration x2: Part 1

Due to a series of strange events, I have ended up with not one, but two Amiga 4000s in the last few weeks. They are both in need of very different restorations. I hope that I can get at least one …

LinuxJedi's /dev/null
Show threadalt_Aug 23, 2023
@LinuxJedi If you encounter problems around these two 74HCT166's near RTC, there is a trick that allows you to remove one of these chips entirely - useful if it's tracks go bad. It only requires a single short bodge wire. In an A4000D it does not perform any function. It only connects to that never used OPTIONS jumper row. It was actually removed in Rev D A4000D. You can compare rev B and D schematics to see how it's different.
Show threadAndrew (LinuxJedi) Hutchings
@alt I thought that might be the case. But I didn't need to look into it. Luckily those ICs were fine 🙂
Aug 23, 2023 at 8:25pmWeb
Show threadalt_Aug 23, 2023
@LinuxJedi Yeah, if it still works. it's fine. But i've frequently seen these areas so eaten up that all traces just disappeared. And in that case it was a blessing not to need that chip at all.