Leonard Silva de Oliveira wrote:
>
> Alwin Henseler wrote:
> >
> > Marco Antonio Simon dal Poz <[EMAIL PROTECTED]> wrote:
> >
> > > > >Do you know a FDC that supports 1.2Mb and 1.44Mb drives and is still being
> > > > >produced, and have good documentation?
> > > >
> > > > Note that 3.5MHz is too slow to allow reading of 1.44MB disks. The "inner
> > > > loop" of the sector read routine is too slow to cope with the data flow. So
> > > > if you want to create 1.44MB drives for MSX, you either have to use 7MHz
> > > > Z80 or use some kind of buffer for reading sectors.
> > >
> I saw a FDC controller wich was used on home console copiers (Mega
> Drive)
> and it's CPU (on the copier mode) is the Z80 running at 3.57mhz ....
> I think that these FDC chip are a possibility to make MSX read HD disks
> It's a SMC chip : 82c765
> or Goldstar GS82C765B
> It needs a 16mhz oscilator and there is ready Z80 code on the Copier ROM
> ...
>
> I think if someone wants to make a diskrom I may dump and give him that
> code on the ROM
> of my copier ... (8kbyes)
>
> The only problem is that I don't know it's pinout or if it is still
> available at the
> manufacturer...
I'd like to add that the FDC is originally a NEC product ...
Greetings from Brazil
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