>> The 7501's from late '83 have no revision number, the early '84 ones all >> say R1. The latest ones I have are from week 14, 1990 which are also R1! > > That's interesting since I have a 8501R4 from 4986. How come they went > back to R1 in 1990? Those from 1990 are 8501 and no longer 7501, right? > Sorry, a correction. The 1490 ones are CSG & not MOS and have no revision number. Yes, they're 8501's. > > Same here... TED, PLA and CPU get a heatsink and I replace the ROMs > with properly programmed 27C128. Saves some power and therefore > produces less heat inside the case. So far I haven't lost a CPU. Maybe > the ones that are still working are not as fragile as the ones that > died already. :) > I wondered that. Maybe the passivation of the cpu's is such that they are more susceptible to ageing once they get past the 'burn-in' they got in the 80's. :-) > >> I found a source of >> 8501's in China last year and got 12 working ones. > > Interesting... All genuine MOS/CSG, no fakes? > I don't think so, they are a mix of production lines and manufacturing dates. If they are fakes, frankly I don't care - because they work! > > And all of the dead CPUs were made in 1984? > For some reason, I keep all the dead ones (perhaps in the hope they'll find a way to repair them in the futue :lol: ) A quick count tells me I have 8 dead 8501's and 2 dead 7501's - all from 1984. I have 2 dead TED's and another 1 with a blown keyboard latch. Rob Message was sent through the cbm-hackers mailing listReceived on 2011-10-27 21:00:16
Archive generated by hypermail 2.2.0.