[A83] Re: microcode
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[A83] Re: microcode
nope... Just assembly.
>From: "The one and only SUCKER ..." <sucker_pvn@hotmail.com>
>Reply-To: assembly-83@lists.ticalc.org
>To: assembly-83@lists.ticalc.org
>
>My question was: Can we program in microcode??
>
> SUCKER
>
> > > Van: Sebastiaan Roodenburg <sebastiaan@rimsystems.nl>
> > >
> > > > Is it possible to make something in microcode?
> > > > (these are the individual instructions which are
> > > > executed with a z80 instruction)
> > >
> > > Nope... microcode is coded into a little piece of ROM inside the Z80,
> >and
> > > since ROM can't be changed... (maybe it can be done with a hardware
> > > hack, but i doubt it)
> >
> >Yesterday I found a book my grandfather used when learning to program, it
> >handles the i8080 (horrible syntax), Z80 and M6800 (that's not the M68000
> >from the Ti89/92[+]). Somewhere in the book I've found some things about
> >microcode, so I'll take a look... Don't give you much of a chance it can
>be
> >done, as far as I have read (Thomas Scherrer's hompage) the Z80 is one of
> >the biggest CPU's which are "hardwired", which says as much as, "it
>doesn't
> >use microcode".
> >
> >Could be that it does work with microcode, but then the problem arises
>that
> >it wasn't that common to have reprogrammable ROM's, just because they
>were
> >to expensive. I don't think that Ti has made an effort of getting a
> >'reprogrammable' Z80... Most of the time Ti has chosen for the safer
> >option, I don't thing that they want people to accidentally change their
> >processor when trying 'secret' OP-codes, or crashing when their calc. And
> >btw, what need would it have for Ti to be able to update the processor,
>one
> >that has been used for about 20y by now?
> >
> > Henk Poley
> >
> >
> >BTW: what was the mail you replied to? (did I miss something?)
> >
> >
>
>
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