Quoting Jim Brain <brain@jbrain.com>: > On 6/28/2018 8:14 AM, Jeff Laughton wrote: >> >> >> Hi, Jim. You'll find some details about timing *differences* in >> Table 7-1 of WDC's 65c02 datasheet [1], which makes a comparison >> with the NMOS 6502. On the 'C02 the $6C opcode (jmp indirect) takes >> one cycle longer. ADC and SBC also apparently take one cycle longer >> if you're in decimal mode. > I am using a Rockwell 65C02. Any info on those? I don't know that > I have a 65c02s here yet. Jim -- I'm pretty darn sure the Rockwell and WDC c02's are identical in regard to cycle-by-cycle timing. Certainly that's true regarding the $B1 and $91 instructions, and those are all that concern us (right?) The WDC part has a few new pins, and two new instructions (STP and WAI), but that shouldn't matter. Hope that helps. I'm pretty sleepy so I maybe won't be able to have a proper look at those traces tonight... Jeff > > JimReceived on 2018-06-29 07:00:05
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