tschak909 Posted August 28, 2016 Share Posted August 28, 2016 Am trying to find a decent reference for ALL 6502 opcodes, including the illegal ones that DASM can assemble. However, I see some with conflicting definitions, (e.g. for DCP, etc.) so what do you guys use? -Thom Quote Link to comment Share on other sites More sharing options...
+Omegamatrix Posted August 28, 2016 Share Posted August 28, 2016 This is what I use for illegal opcodes: Illegal Ops.txt Note for the double and triple NOP's (DOP and TOP), you still just use NOP for DASM. Quote Link to comment Share on other sites More sharing options...
Thomas Jentzsch Posted August 28, 2016 Share Posted August 28, 2016 I am using this. Quote Link to comment Share on other sites More sharing options...
tschak909 Posted August 28, 2016 Author Share Posted August 28, 2016 oo, thanks. I like TJ's chart. I'm going to print that. -Thom Quote Link to comment Share on other sites More sharing options...
TheHoboInYourRoom Posted September 7, 2016 Share Posted September 7, 2016 (edited) Another option is to look at DASM's source. This file has illegal opcode mnemonics in an array called Mne6502illegal[], except for the illegal NOP addressing modes (related to what Omegamatrix said). Might be useful since there's not much standardization of the actual mnemonics. Edited September 7, 2016 by TheHoboInYourRoom 1 Quote Link to comment Share on other sites More sharing options...
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