Re: 6502 illegal opcodes questions

[pausch@saaf.se (Paul Schlyter)]

In article <op.s9uev3d6ru4cq2@news.t-online.de>,
John Selck <gpjiweg@t-online.de> wrote:
>Am 12.05.2006, 04:21 Uhr, schrieb Michael J. Mahon <mjmahon@aol.com>:
>
>> And in any case, depending on the peculiarities of a particular chip
>> implementation is just asking to be locked out of future improvements.
>
>Like I stated several times now: You can easily do a processor check and
>use different code. On plain 6502 you use the faster routine with illegals
>and on 65816 etc you use a normal routine. It's 5 minutes work to do that.

...and how do you account for future versions of 6502 in that
processor tests?

That's of course a non-issue for the 6502, where there will be no
future versions.  But the issue is still valid for other processors
where there may be future versions.


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