At 04:51 PM 7/19/99 -0300, you wrote:
>>Well, then maybe we can disassemble and adapt turboR-programs. I mean, the
>>only non-Z380 compatible instructions are MULUW and MULUB, aren't they???
>>The other ones also work on a Z80 (though undocumented). I bet the Z380 has
>>a good counterpart for MULUW and MULUB... So that shouldn't be too
>>difficult. Just search for the opcode and replace it.
>
> It can be made by hardware, because Z380 has a special feature, like an
>interrupt when an unknown command is found... So these instructions can
>be redirected to another single processor that only execute these
>instructions.
That only works if the opcodes are unused (no instruction is mapped to
them). But if a different Z380 instruction is mapped to the R800 opcode, it
is not trapped but the (wrong) Z380 instruction is executed instead.
I think the latter is the case: R800 opcodes speficy different instructions
on Z380.
> I think it would be nice to make the suggestions and discussions here, and
>the need for a Web page will be only to comunicate to everyone the
>decisions (and not the suggestions or ideas).
Yes, the web page will serve as a reference and a log, but it won't be the
place where the discussion is held.
Bye,
Maarten
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