At 03:35 PM 6/10/99 +0200, you wrote:
>Does somebody know what must be changed in the disk rom, to use 1.44 Mb disks
>on a msx2.
It would have to support a new media ID, by defining a Drive Parameter
Block for it. That would contain info like "first directory sector" and
"total number of sectors".
In DOS1, the directory is fixed at sector 7, but DOS2 seems to actually use
the values in the DPB.
One problem is that MSX uses #F0 as media ID for hard disks, but PC uses it
as media ID for 1.44MB floppies.
Another problem, which was discussed on this list some time ago, is that a
3.56MHz CPU is too slow to read bytes from the FDC at the high density
transfer rate. So you either need some kind of buffering or you need a CPU
running at a higher speed.
Bye,
Maarten
****
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/)
****
