At 05:20 PM 9/21/98 +0200, you wrote:
>:By the way, did anyone actually compare R800 and Z380 opcodes? If we're
>:lucky, there are "semi-accidentally" compatible.
>
>That was an idea I wrote about a while ago too (but then in comp.sys.msx???)
>Anyway, I think the instructions are compatible, for most of the
>instructions of the R800 were already undocumented instructions for the
>Z80...
Bad news...
The IXL/IXH/IYL/IYH instructions seem to be compatible.
The IN F,(C) instruction was present on the Z80, so Z380 can probably
handle it, although it is not documented in the Z380 manual.
But the opcodes of the R800 multiply instructions are used for completely
different instructions on the Z380. For example R800's "MULUB A,B" is a POP
instruction on the Z380.
Bye,
Maarten
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