On 6/18/20 7:37 PM, groepaz_at_gmx.net wrote: > Now run the "delay2-new" and "delay2-old" programs. Green border means "test > passed", and will generally tell if you have a "new" or "old" CIA. (Contrary > to popular belief this can NOT be reliably determined from whats written on > the chip) So far I was always able to tell what kind of CIA it is by looking at the chip. No, the 'A' after the 6526 is not an indicator. I do know 3 CIAs though: 6526 (sometimes with 'R4') 8521R0 (also labeled as '6526' with '206A') 8521R1 (labeled 6526 with '216A') The question is, can you tell the 8521R0 und R1 apart via software? I have seen the 8521R1 stamped as '6526B', meaning good for 3 MHz. GerritReceived on 2020-06-18 21:00:03
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