> I missed the main message somehow. But I use interrupt-driven
> methods that are quite reliable

Bob, Ian did say, in his message which you missed unfortunately,
fast in BIG letters and that he had plenty of spare pins. 8-bit parallel
would seem to be the easiest and fastest in that situation. I've done
it with PIC-to-Scenix data transfers for a pair of steppers and it's
wicked quick, just a couple of us



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