The instruction timing is different.

It could be done, it would take a lot of work.

I guess if it was slowly migrated it would be handy, some of my z180
code
would be seriously broken over timing issues (instruction and wait
state etc
would all have to be accounted for)

MMU and other peripherals would be a straight bonus for use with the
existing z80 core, the only immediate instruction would probably be
the
out0.

cya, Andrew...

--- In zxgate@yahoogroups.com, "James Diffendaffer"
<jdiffendaffer@y...> wrote:
>
> Actually, after looking at the code I thought most of the
instructions
> wouldn't be that difficult. SLEEP would require a little work to
> fully implement but imitating it's functionality from a software
> viewpoint might not be so bad.
>
> As for mmu every address decode has to use the mmu registers...
which
> may or may not be a big deal. I just started to look at the code
so I
> really don't know yet.
>
> Serial ports should be simple.