On 10/27/2011 09:52 PM, crock wrote: > >>> All the cpu's are 7501's and plastic. The earliest one is week 51, 1983. >> >> Are they all R1 or are there other revisions? I only have a single >> 7501 which is an R1 from 2684. All the other CPUs are 8501R1. >> > 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? > I don't know how much has to change to get a new revision number but > those ones from 1990 run *MUCH* cooler than all the others, which get > hot to the point of burning your fingers. I always heatsink them now. 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. :) >> What does surprise me is that the 8501 was still made in 1990, looks >> like MOS kept making spares even though the 264 line was dead. >> > IMHO, the cpu expires more frequently than the TED. Back then everyone agreed that TED was more fragile, especially the 8360R1 version. Seems everyone was wrong after all. > I found a source of > 8501's in China last year and got 12 working ones. Interesting... All genuine MOS/CSG, no fakes? > I then bought several > 'defective' +4's and 16's of ebay and got all of them working. ~70% had > dead cpu's. And all of the dead CPUs were made in 1984? Gerrit Message was sent through the cbm-hackers mailing listReceived on 2011-10-27 21:00:03
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