24 Feb
1998
24 Feb
'98
10 a.m.
Allison J Parent wrote:
The 8008 does not have memory mapped IO, there are
distinct IO
instructions. It's not to say MM/io is not done. The PDP-11 memory
and devices are the same things and there are no specialized IO
instructions.
The altair...(8800 and 8800a) from the front pannel
there is no way to
interrogate an port mapped IO device or write to it. You must do it with
a little code.
But surely this is a limitation of the front panel not the processor.
I/O bus cycles can (easily) be generated from an appropriately designed
front panel.
--
Hans B. Pufal : <mailto:hansp@digiweb.com>
Comprehensive Computer Catalogue : <http://www.digiweb.com/~hansp/ccc/>
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