On 12/11/2011 12:34 PM, Segher Boessenkool wrote: > >> The oldest CIA I have so far is a 6526R4 with a 2383 datecode. > > The oldest I have heard of is week 14 of 1983; those come without > the R4 marking. Some time in 1983 or 1984 they switched to without > R4 marking again (what revision is in there, I have no idea). Probably R4 too. From what I have seen so far MOS sometimes dropped the R-number after a while for unknown reasons. > The last weeks of 1985 got us the 6526/S (whatever that is), and in > 1987 they switched to the 8521 (marked as 6526A, 216A). There are some that are labeled '8521R0'. 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'). Gerrit Message was sent through the cbm-hackers mailing listReceived on 2011-12-11 13:00:04
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