On Thu, Sep 2, 2021 at 1:27 PM Gerrit Heitsch <gerrit_at_laosinh.s.bawue.de> wrote: > > > Now time to get a working VC-20. What's the most common "black screen" suspect on the VIC? > > Besides VIC itself? The ROMs and if they are present, the 65245 bus > buffers. The latter can be replaced by 74LS245. > > But I also had bad RAM, a bad LM323 voltage regulator and a bad 74LS138. I can add also (from real repairs): 6502 (very rarely, but happens), the 7402 on the clock generator, a 6522 jamming the databus. > > So dust off your scope and go hunting. that's the only good way. Frank IZ8DWFReceived on 2021-09-02 15:00:02
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