30 Oct
2010
30 Oct
'10
1:52 p.m.
OK, it's fair to say that there's nothing that precludes memory-mapped I/O =
in any machine (except perhaps physical memory architecture, although I can=
't think of an example). But port-mapped I/O machines had specific instruc=
The obvious problem would be if the memroy map is already totally full.
If you've got a Z80 systme with 64K of memory, it would be perverse to
try memory mapped I/O (you could have some kind of MMU, but why...).
Similarky trying to emmeroy map any kind of I/O on a 2MByte PERQ would be
an 'interesting' exercise...
-tony