On Fri, 21 Apr 2000 11:30:46 +0200, Laurens Holst wrote:
>By the way, about the instruction remapping... How can the difference
>between data and instructions be made??? Is there a seperate signal for
>instruction fetch on the Z180??? On the eZ80, it could easily be changed...
>But I don't know about the Z180. If it can't use the undocumented opcodes of
>the Z80, the Z180 is not really an option, because a lot of stuff won't work
>then.
It's easy to separate what is instruction and what is data. All processors
set up a signal when are fetching instructions, different from the signal
generated when fetching data. (-: If I remember well, on Zx80 it's called
M1) The translation hardware has just to "look" what the processor is looking
for: if it's looking for instructions, the circuit translate. If it's looking
for data, the circuit doesn't translate.
AbraçOS/2, Daniel Caetano ([EMAIL PROTECTED])
...!m.tag
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