On 2/22/25 19:29, Uffe Jakobsen wrote: > Gerrit Heitsch writes: >> On 2/22/25 18:28, Francesco Messineo wrote: >>> >>> I've never seen a good 8501 in my whole life so far. I have made a >>> replacement for it with a 6502 and 2 x ATF1502 CPLDs, this is barely >>> larger than the 8501 itself. But I only have one C16 that was donated >>> many years ago by a friend. >> >> The 8501R4 or 8501 without R-Number seem to last. I have a few of >> them, a few years ago a number popped up on ebay for a low price. >> >> I still have working 8501R1 too. >> >> My 7501R1 failed though. >> > > > So maybe the 7501/8501's aren't as that bad as their reputation - it > just comes down to them being used in a "bad" design... > > Any thoughts about this theory ? Yes.. That 7501R1 was on a spare board that I never connected to anything. Just hooked it up to a monitor and power supply for testing every few months. And one day it just didn't start. Replacing the 7501R1 with a known working 8501R1 fixed the issue. So the CPU just died. GerritReceived on 2025-02-22 20:00:19
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