Happy Birthday VAX 11/780 (influence of)
ard at p850ug1.demon.co.uk
Fri Oct 29 15:55:08 CDT 2010
> > Just because a CPU architecture has IO instructions doesn't mean you
> > can't do memory-mapped I/O.
I beleive Steve Ciarcia said in one of the Circuit Cellar articles in
Byte many year ago that any processor that could access memory could have
I would add that in the case of a system (rather than a bare processor),
it helps if there's some spare space in the memroy map :-).
> And there were other PC displays, that didn't use memory-mapped video
if by 'PC' here you mean something descended from the IBM5150 then I am
curious. All the IBM dipslay adapdaters that I can think of were memory
mapped. Yes, even the PGC had a memory-mapped CGA emulation.
I do rememebr reading about TMS34010 development boards for the PC. Is
that the sort of thing you were thinking of?
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