Re: AltairZ80 simulator updated



"Axel Berger" <Axel_Berger@xxxxxxxxx> wrote in message news:200807301425.a54811@xxxxxxxxxxxx
*Barry Watzman* wrote on Tue, 08-07-29 02:55:
memory mapped I/O

Please correct me, but as far as I know neither the 8080 nor the 8086
nor any of their derivatives use memory mapped I/O.

They both could use it as could the Z-80 (see TRS-80 Model I and III).
The video on the IBM PC was memory mapped (and still is on IBM
compatibles these days. Of course anything more than CGA also uses ports
to map banks of video RAM into the CGA area.
Memory mapping isn't a function of the CPU, it's a function of the support chips.

Tom Lake

.

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