On Friday 04 November 2011, you wrote: > >> Opcodes $8b and $ab are not predictable in that their result > >> depends on > >> various analog effects; their behaviour can vary on a single physical > >> chip when it heats up, even. > > > > these are predictable though - if you choose the right argument :) > > not that > > ane #$00 is terribly useful =P > > What is that, 8b? Most people call that XAA afaik. yes :) and XAA is long "deprecated" imho, only ppl who know it from the old broken lists call it like that =) > >> Various opcodes are unpredictable in the sense that their result > >> depends > >> on what happens on the data bus while RDY is low. > > > > i would not call that unpredictable > > If you have full control over what happens on the bus, sure. In most > cases you do not -- it is specifically designed so you do not have to. > > This also happens just for 8b and ab fwiw. All other illegal opcodes > are more or less sane, where 10xxxx11 is the "less" and the rest is the > "more". (*) > > > Segher > > (*) Oh and of course the STX abs,Y and STY abs,X (9e and 9c) insns, > those > are naughty! SHY and TAS you mean =) those are which i ment - they work perfectly if you make sure nothing else tries to access the bus :) (and unlike ANE, they are sometimes useful) -- http://www.hitmen-console.org http://magicdisk.untergrund.net http://www.pokefinder.org http://ftp.pokefinder.org Education is what you have left when you have forgotten everything you learned in school. <Albert Einstein> Message was sent through the cbm-hackers mailing listReceived on 2011-11-05 18:00:15
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