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...
Greetings from Brazil
****
MSX Mailinglist. To unsubscribe, send an email to [EMAIL PROTECTED] and put
in the body (not subject) "unsubscribe msx [EMAIL PROTECTED]" (without the
quotes :-) Problems? contact [EMAIL PROTECTED] (www.stack.nl/~wiebe/mailinglist/)
****
