Re: 6502 illegal opcodes questions

[buchty@atbode100.lrr.in.tum.de (Rainer Buchty)]

In article <qh1wuqmoqz.fsf@ruckus.brouhaha.com>,
 Eric Smith <eric@brouhaha.com> writes:
|> buchty@atbode100.lrr.in.tum.de (Rainer Buchty) writes:
|> > There are quite some "it wouldn't work otherwise" examples, though,
|> > which require those undocumented opcodes to meet strict timing.
|> 
|> Such as?

IIRC the S-JiffyDOS patch uses illegal opcodes to speed up GCR decoding.
(Jochen, are you reading here and can comment?)

And I'm sure quite some demos contain illegal opcodes to either make
effects possible at all or get the max out of the raster timing.

Rainer