MITS 2SIO serial chip?

From: Ben Franchuk <>
Date: Sun Dec 16 12:45:01 2001

"Peter C. Wallace" wrote:
> On Sun, 16 Dec 2001, Richard Erlacher wrote:
> > I disagree that it's a mess. I haven't looked at the requirements for a Z80
> > peripheral since the early '80's, but I can assure you that I'd dispose of any
> > 1st year engineering intern who couldn't whip up a suitable PAL or equivalent
> > MSI/SSI logic to handle the generation of properly timed inputs to the thing in
> > an hour or less.
> Sure its trivial to do now but we were talking 1981 when PALS were
> expensive.

I never heard about pal's until about 1990. In some ways the peripheral
chips are in a really sorry shape. You have vintage slow I/O (2 MHZ?)
or PC motherboard chip sets. Nothing in between. On my FPGA I can run
with a 250 ns memory cycle, but need to stretch it to 625 ns for I/O.

Ben Franchuk --- Pre-historic Cpu's --
Received on Sun Dec 16 2001 - 12:45:01 GMT

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