Re: 6502 illegal opcodes questions

[pausch@saaf.se (Paul Schlyter)]

In article <e4fdtv$2fj$1@rzsun03.rrz.uni-hamburg.de>,
John Selck  <selck_j@informatik.hgv-hamburg.de> wrote:

> Michael J. Mahon wrote:
.............
>> Non-portable code is written for two quite different reasons:
>> 
>> 1) Because the coder doesn't even think about portability or
>>    doesn't understand it, non-portablility happens.
>> 2) Because the coder understands perfectly, and chooses to
>>    write non-portable code on purpose.  (One-time use, static
>>    platform, compelling need,...?)
> 
> 3) Slow-as-hell 8 Bit platforms don't have a proper abstraction layer 
> for any of their hardware, no matter if sound, graphics, timers, ports 
> or CPU.

???????????????????

Could you point at one single case where use of undocumented opcodes did
significantly speed up an application on the 6502 platform?

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