On Sun, Dec 13, 2015 at 10:22 AM, tony duell <[email protected]> wrote: >> >> I've done the obvious, reseating socketed ICs, checking the +12V and +5 >> rails, and checking the on-board CPU reset line. Does anyone have any tips >> for what's best to try next? > > Didn't at least some versions use 2114 RAM chips? If so, then check/change > those first
I don't think any of the single-disk CBM drives used 2114s (but I agree - those are favorite suspects when present). I'm pretty sure all the units I've worked on have 6116-type 2K SRAMs or perhaps 6264s. I'd have to go back and check parts lists, but the older dual-drive units might have had 2114s as the shared memory between the two processors. -ethan
