hi,
look this: 6581 R3 - Will say "6581" only, "6581 R3" or "6581 CBM" on the package. Had a minor change to the protection/buffering of the input pins. No changes were made to the filter section. Made from before 2083 until 1386 or so.
(from: http://en.wikipedia.org/wiki/MOS_Technology_SID )
So do you search a SID only if it is marked "6581R3" or it can be "6581CBM" or 6581 from 2083 to 1386?
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