> Have you thought about emulating the serial interface over tcp/ip
> that way two emulators can run on two or more separate PC's, and all
> the ...
> you could even have all the cpu clocks kept in sync with netowrk messages
> the emulators may run slow, but accurate with respect to each other.
>
> if only gigabit networks where cheaper

Er, why do you need a gigabit network to model the interaction of a two
megabit serial channel?