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Re: Some changes I want to submit
02/22/08 08:24 AM
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> IIRC there were 6502's that were manufactured without something like ROL A ( I can't
> remember what, it's been over 20 years ). I doubt we support those properly either.
>
Yes, ALL 6501s, 6502s, 650x where x is 3-9, manufactured before the ?25?th week of 1975 had the ROR and ASR instructions non-functional (I'm not entirely certain what they did but they didn't do what they were supposed to). Mess does not yet emulate this, and it is significant for the earliest KIM-1's. The KIM-1's built-in cassette routines depend on these opcodes, and would NOT work on early machines!
LN
"When life gives you zombies... *CHA-CHIK!* ...you make zombie-ade!"
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