On Thu, Nov 4, 2021 at 4:31 PM Jim Brain <brain_at_jbrain.com> wrote: > > I'm surprised they didn't use their > internal 65XX RAM option (6550?) basically 6550 were already an "old" thing by 1979. Even the original 2001 motherboard had at least two revisions that used 2114 instead of 6550. MOS made its own 2114 too, but in my repair records, these are failing a bit more often than other brands' ones. 6550 tend to be a bit too unreliable too. I have a collection of 16 failed ones from the repaired 2001 of the last few years. My own 2001 alone "donated" 10 of them to the "failed collection". However the 18 x 6550 it has now are still working today. Using a 6550 instead of a 2114 for color ram on the C64 would have been pointless anyway, since the big differences are just the great flexibility in the CE choices (5 different CEs on 6550) vs. one /CE on the 2114 and the bigger size of the 6550 (22 dip 400 mils). Frank IZ8DWFReceived on 2021-11-04 17:02:38
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