Wanted: another 12C for reverse-engineering (two-chip, non-diaper)

[brouhaha]

(11-16-2022 12:24 PM)Mark H. Shin Wrote:  If you would save me the trouble of researching the proper serial range, I have two USA models:
Edit: After reviewing Chuck McCord's Powerpoint slide, it appears S/N 2540A33867 (1985 week 40) would fit the bill, if I'm mistaken...

I think you're correct. 2540 should be the two-chip, single-PCB non-diaper model. I beleive that model first appeared some time in late 1982 or early 1983, but I'm not completely ceertain.

It's very unclear when the switch to SST actually happened in production, but it seems reasonably likely that a 2908 (early 1989) might be an SST.

Unfortunately when I was dumping Voyager ROMs years ago I didn't keep good records of the ones I opened, but it was a fairly small number of samples.

Thank you!