On Fri, Jun 19, 2020 at 12:40 PM 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. > > > > 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? In my MOS dead parts collection I have 2 x 7707 (and some 7708, 7709, 7713). I've never repaired an US C64, since I have just one of them and it's still on the bench (waiting for a virgin PLA to come). It has no 77xx parts though. So I'd say it's quite random when or where you'll find some 77xx parts. I've found them on 1541s too. FrankReceived on 2020-06-19 13:00:46
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