On 12/11/2011 08:52 PM, Segher Boessenkool wrote: >> The one I have has the datecode 4586. There are other 6526A from the >> end of 1986 that are likely the HMOS-Version, they also show the timer >> 'bug' and the test program lists them as '6526A'. The earliest one I >> have in that regard is labeled '6526A 4686 206A' (not '216A'). > > Interesting! I suspect that is an 8520 actually... Can you test that? It's soldered to a C64 mainboard and behaves like a 6526A as far as the software goes. The 8520 doesn't have the RTC but a 24Bit timer instead as far as I know, so I think you'd notice if you tried to use a 8520 instead of a 6526. It's not the only board in my posession with a 6526A with '206A' markings, but that's the earliest datecode. > Supposedly they also did an 852x that has only the low four ports (or > the rest is not functional, anyway), i.e. the two parallel ports only; > it was called something like 5210 (I forgot the exact name, and cannot > find it anymore). 5710 if I remember right. Gerrit Message was sent through the cbm-hackers mailing listReceived on 2011-12-11 21:00:17
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