Subject: RE: [stella] Instruction timing tip From: "Lee Fastenau" <stella@xxxxxxxxxxxxxxx> Date: Sat, 9 Oct 2004 00:11:38 -0500 |
> > I commend your effort in trying to come up with a > > general formula. I don't know though...I think the > > exceptions make it almost as hard as just memorizing > > the chart though, IMHO. :) > > Right; I tried this approach before, when I split the instructions into > various categories, and provided cycle counts for all of the addressing > modes. I probably should have included tables that would make it more > useful as a cheat sheet, at least. > > But, really, there's no substitute for experience here. As you program > 6502 and apply cycle counting, you'll start to get a feel for it. > Especially if you're programming the 2600. It's just like how BASIC > programmers used to have to look up all those PEEK and POKE addresses, > but had them all memorized after a while. FWIW, here's the cheat sheet I built and live by: http://www.ioyu.com/io/atari/images/cyclechart.gif And the original in MS Excel version if anyone's interested: http://www.ioyu.com/io/atari/images/Cycles-6502.xls I don't remember what sources I used to build it, but I just needed a compact view without a lot of extra information. Apologies if anything is incorrect. -Lee
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