Path: utzoo!utgpu!watserv1!maytag!xenitec!zswamp!root
From: root@zswamp.fidonet.org (Geoffrey Welsh)
Newsgroups: comp.sys.cbm
Subject: Undocumented 6502/6510/8502 instructions?
Message-ID: <4692.2746174A@zswamp.fidonet.org>
Date: Sat, 17 Nov 90 12:30:21 EDT
Organization: Izot's Swamp BBS - Kitchener, Ontario

Brian R. Murphy (brm@Neon.Stanford.EDU ) wrote:

 >Can anyone give me a reference to a description of what the
 >undocumented op-codes do on the 6502, 6510, and 8502?  I 
 >recall seeing
 >a list for the 6502 in a magazine somewhere, but don't 
 >remember where
 >I saw this, and wondered whether anyone had done the same 
 >for the 6510
 >and 8502.  Would these be the same?

   I have seen an article in the Transactor, but I don't remember which issue. 
There is a page near the back of Raeto Colin West's "Programming the PET/CBM" 
(COMPUTE!), and it's reprinted in the "Complete Commodore Inner Space 
Anthology" (Transactor's all-purpose reference book).

   The 6510 and 8502 seem to act exactly as the 6502 did, but you should be 
aware that programs which use the reserved op codes won't work on processors 
like the 65C02 and 65816. This is why PaperClip won't work with the 4 MHz 
speedup board for the C64.
 


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