> On 2020-06-19, at 12:39, Baltissen, GJPAA (Ruud) <ruud.baltissen_at_apg.nl> wrote: > >> C64 DRAM has a high failure rate but... > > I repaired a lot of boards but I myself never encountered a broken DRAM. 41464 on the narrow C64 boards were number one failures for me on those boards. And then even more so once CBM began supplying PSUs with only four pins in the plug ;-) >> I had a lot more dead 7708 (74LS257), 7709 (74LS258) and 7707 (7406) than their 74xx equivalent. > > I have seen a lot of boards but I was a bit surprised by the number of 77xx ICs. I know about the 7711 but I never saw a 7707 for example. So I wonder, how rare are these? Or were they mainly used in the USA and not Europe? I barely recall seeing them in EU, at least nothing imprinted in my memory cells, even if a really large number of C64s passed through my hands back then. It was just a few days ago when we encountered a different behaviour of one of the boards when testing TVS subcircuit on the BeamRacer board. And his board is a US market one. -- SD!Received on 2020-06-19 13:01:19
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