Subject: Re: [stella] "Illegal" opcodes From: "Thomas Jentzsch" <tjentzsch@xxxxxx> Date: Tue, 20 Jun 2000 10:02:12 +0200 |
I've compared undoc.asm (DASM: John Saeger) with another source (Sally: http://alt.xmission.com/~trevin/atari/6502_insn_set.html). This is the result (use a fixed font to read the table): DASM Sally ----------------------------------- anc = ane axe different mnemonics only arr = asr = dcp = isb = las = lax = lxa xea different mnemonics only nop = rla = rra = sax = sbx asx different mnemonics only sha ax7 M' = A & X & (ADDR_HI+1) | M' = A & X & 07 shs xs7 S' = A & X; M' = S' & (ADDR_HI+1) | S' = A & X; M' = S' & 07 shx sx7 M' = X & (ADDR_HI+1) | M' = X & 07 shy sy7 M' = Y & (ADDR_HI+1) | M' = Y & 07 slo = sre = I haven't found many differences, mostly different mnemonics. But sha, shs, shx and shy are explained a bit more complicated in undoc.asm. There are also other sources in the internet, with more different informations. Look at http://wwwstud.ira.uka.de/~s_tomczy/opcodes.html So someone must check these opcodes. Thomas _______________________________________________________________________ 1.000.000 DM gewinnen - kostenlos tippen - http://millionenklick.web.de IhrName@xxxxxx, 8MB Speicher, Verschluesselung - http://freemail.web.de -- Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://www.biglist.com/lists/stella/
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