> An 8500 will react slightly faster to AEC than a 6510, but that's > still > not enough. There are two big board differences as well though: the > C64 has a 1.5kR pullup on R/#W, while the C64C has 3.3kR; Two 3.3kR in parallel (from a resistor array). So that's not it. > and they use > a very different PLA (or custom chip actually, for the C64C). The > 82S100 > PLA used in the C64 has a propagation delay of typical 40ns, max. > 80ns. The C64C uses a LH5062 Sharp CMOS part. It might well be faster, but who knows. My current theory is all the components are just a little different, and it all conspires to make R/#W or #CS too early :-) Segher Message was sent through the cbm-hackers mailing listReceived on 2011-11-19 12:00:08
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