On Tue, 23 Mar 1999, shevek wrote:
> On Mon, 22 Mar 1999, Marco Antonio Simon dal Poz wrote:
>
> > On Mon, 22 Mar 1999, shevek wrote:
> >
> > > On Mon, 22 Mar 1999, Marco Antonio Simon dal Poz wrote:
> > >
> > > > For the most part of diskroms, DMA can be in page 1, because they have
> > > > access to FDC through addresses 7FF8h-7FFCh and also BFF8h-BFFCh, and they
> > > > transfer a small routine to F1BFh (or something like that) that allows a
> > > > disk transfer to happen in page 1.
> > >
> > > Is that MSX-standard or just the case on many MSXs?
> >
> > The standard doesn't say anything about the method that the diskrom should
> > use. So, it's just the case on many MSXs. The standard only says that the
> > interface should use memory addresses to transfer data between CPU and
> > FDC.
>
> Ok, but this means that using DMA in page 1 is against MSX standard, or
> not?
Given that the standatd doesn't say anything about this, it's not against
the MSX standard!
Greetings from Brazil!
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Marco Antonio Simon Dal Poz http://www.lsi.usp.br/~mdalpoz
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