On 09/22/2011 10:35 PM, Groepaz wrote: > so if you want to know what kind of cia you really have, run a program that > tests the interrupt delay ( for example > http://noname.c64.org/csdb/release/?id=89406 ) Thank you for the URL. Did a test run on my systems and got the following: 6526 (1384) is seen as a 6526 6526R4 (3583) is seen as a 6526 6526 (3086) is seen as a 6526 6526B (4887) is seen as a 6526A 6526A (3089) is seen as a 6526A (*) 8521R0 (4586) is seen as a 6526A (**) (*) The 'A' is not part of the original marking, it was added later. (**) That one came from a 1571 drive. It's a pretty small dataset, but it makes me wonder whether Commodore intended to use the 8521 as the 6526 replacement in HMOS-II but later just continued to mark the CIAs used in C64 and C128 '6526A' no matter what was in there. Maybe ot avoid confusion? Gerrit Message was sent through the cbm-hackers mailing listReceived on 2011-09-24 13:00:03
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