Happy Birthday VAX 11/780 (influence of)

[Tony Duell]

> > 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 
memory-mapped I/O. 

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?

-tony