On Thursday 22 September 2011, you wrote: > if it is different behavior from drive to drive then this let's me think > on different CIA revisions. 6526 vs. 6526A vs. 8520, you know even VICE > does support two different 6526 types, the "old" and the "new" one which > have some off-by-one clock cycle differences. and that said, NEVER trust whats written on the chip package. i have seen all kinds of combinations by now, they probably just used what whats there and slapped a label on it (its commodore afterall =P) - the manufacturing date seems to be more relevant than A or not or 6526 vs 8520 :) (eg i have one "flat" c64 here, with one 6526A and one 6526 on it, which both exhibit "new" behavior) 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 ) Message was sent through the cbm-hackers mailing listReceived on 2011-09-22 21:00:27
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