Subject: Re: [stella] Games using unofficial opcodes From: Adam Wozniak <adam@xxxxxxxxxxxxxxxx> Date: Wed, 1 Jun 2005 13:23:01 -0400 |
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 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 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.1 (GNU/Linux) iD8DBQFCne7UyvXf5Z0z5zERAn09AKDNEOEPW9LaG8ZQDfO8JjmtRzObLACfQaOf +k/6JWY7e7QY1ZdRyBgs3aM= =QcmB -----END PGP SIGNATURE----- Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://stella.biglist.com
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