On Sun, Nov 30, 2014 at 01:54:30AM +0100, firstname.lastname@example.org wrote: > I ran the tests. Tried earlier but they take much longer than I thought > so I finished only tonight. And.. the MOS 6502AD passes all the tests > from that suite. The R6502AP fails repeatedly on one called "pc64-aneb". > Since the mnemonics are different from what I once learned I don't know > what command this is. Probably something from the AND family. But the > difference is there every time I run the tests (why - BTW - does it have > to spin the motor all the time?) That seems (from the name) to be testing ANE, a.k.a. XAA, op $8b. It is the most unstable unsupported op, giving different results _per run_ on some MOS/CSG devices as well. It is heavily temperature, process, batch, phase-of-the-moon, you-name-it dependent :-) Searching for 6502 opcode "ane" gives you the visual6502 wiki page for this as first hit. (The other unpredictable op is $ab, "LAX"; all the rest are completely predictable, although a few depend on whatever is on the bus if you use RDY (which your 1541 testing does not use AFAIK)). Segher Message was sent through the cbm-hackers mailing listReceived on 2014-11-30 02:00:03
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