Subject: Illegal opcodes (was Re: [stella] Reading Paddles?) From: "Dennis Debro" <ddebro@xxxxxxxxxxxxx> Date: Sun, 12 Jan 2003 20:34:12 -0500 |
Hi Thomas, > BIT is very useful. I have been explaining BIT tricks several times. > Search the archives! ;-). > > BTW: I prefer using an undocumented (illegal) NOP instead ($82 or $$0c), > because that doesn't change the flags. :-) I had been studying your Robot City source. That's where I saw you use the $0C opcode. I was confused and went to look up the illegal 6502 opcodes. I saw that it went to skip the next word. I would recommend to anyone trying to tighten up ROM usage or cycles to visit http://www.s-direktnet.de/homepages/k_nadj/opcodes.html or any site similar. Take care, Dennis ---------------------------------------------------------------------------------------------- Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://www.biglist.com/lists/stella/
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