> >there is a
> > working mode (selectable via jumper in the board) in which Z380 replaces
> > MSX Z80, but you must cut one or two pins of the Z80. Do you dare? Me
not.
>
> If your CPU is in a socket (like mine, a Z80H), that's no problem at all.
> Z80 CPU's are available everywhere and they're cheap. The question is how
> this will affect the rest of the computer? I'm thinking of timing, for
> instance.
It's in a socket, yes.
I heard about a Z80 which runs up till 20 MHz...??? How to use it?
I don't know much about clock chrystals...
And the timing of the several devices... I think there should be some kind
of 'engine' which is between the processor IOREQ pins and the databus, and
monitors all I/O operations. It has a minimum wait time defined for every
port, and when another access is done too fast, it sends a signal to the
CPU's WAIT pin... Like the turboR does (doesn't it?)
Also nice: a small buffer! So it can for example buffer up to five
sent-too-fast bytes...
~Grauw
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