> For sending, anything over 4 cycles won't work, so receiving is > probably moot. (Oh, and 65C02 instructions are illegal. ;-) You say that a lot about 65C02, but the target in this case IS a //c after all. :-D I think that in this one case it's a forgivable sin. But, as you say, if 6 cycles is too slow then the serial port idea is a non-starter. Oh well, it was worth a shot! -B