Re: [stella] Games using unofficial opcodes

[Adam Wozniak <adam@xxxxxxxxxxxxxxxx>]

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On Wed, 1 Jun 2005, Dennis Debro wrote:
> I looked at this and I think it uses one by accident. It does a jmp to
> LF01F which would cause the sax (opcode $83) instruction to be called.
> They could have jmp'd to LF021 (which is the Veritcal Sync routine) which
> would have bypassed this and the game would have worked the same.

Is there a good complete opcode reference that includes all the undocumented
instructions?

http://www.s-direktnet.de/homepages/k_nadj/opcodes.html
pro: discusses undocumented opcodes
con: difficult to search, doesn't list status flags affected succinctly

http://www.6502.org/tutorials/6502opcodes.html
pro: hyperlinks for easy navigation
con: no undocumented opcodes, doesn't list status flags affected succinctly

http://members.chello.nl/taf.offenga/illopc31.txt
pro: lists alternate names for undocumented opcodes
con: doesn't list status flags affected succinctly

http://www.xmission.com/~trevin/atari/6502_opcodes.html
pro: big chart has lots of information
con: difficult to read, doesn't list status flags succinctly

http://www.oxyron.de/html/opcodes02.html
pro: nice charts, status flags affected are listed
con: descriptions are terse, unclear which opcodes are not available on 6502

http://axis.llx.com/~nparker/a2/opcodes.html
pro: nice charts, nice explanation of how opcodes are decoded
con: few english descriptions

Is there a web page somewhere that combines the best of all these?
One geared for atari 2600 programmers?

- -- 
adam@xxxxxxxxxxxxxxxx        http://cuddlepuddle.org/~adam
KG6GZR                       http://cuddlepuddle.org/~adam/resume.html


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