hmmm....very interesting.
So the amstrad is digital/ttl level?
Now I'm thinking of my other amstrads I've just sort of ended up with. Ie, the ibm compatible one that looks like the a500...don't remember its name atm, and my scary portable that runs off D cells and has a built in modem.
I've been meaning to play with the cpc464 a bit more. Looks like an interesting machine. Been too busy with everything, including torturing my poor a500.
Also been meaning to set up a c64 again. I miss them.