>
>
> I had terrible r-m-w problems driving several 74HC gates due to
> the collected capacitance of inputs and wiring. As well as the nops
> found a 1k loading resistor for the PIC pin helped


Yup, though RMW isn't a problem I've had to deal with in AVR land. :)

Driving a significant bus isn't trivial, and as you mention, some series
resistance at the driving end helps, by lowering the current into the bus
impedance.  Termination impedances also help, but you'll need to look at it
with a scope to see what you're doing.

I had a problem once with an Acer motherboard in a server machine due to
improper termination on a line.  The thing was giving all sorts of problems,
but once we found the line, we were able to change the terminating impedance
to get it under control.  AFAIK, acer put the fix into production on that
board.
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