31 Dec
2001
31 Dec
'01
3:37 p.m.
On Mon, 31 Dec 2001, Fred Cisin (XenoSoft) wrote:
On Mon, 31 Dec 2001, Don Maslin wrote:
Agreed! But were they not also, perhaps, capable of coping with the
`dreaded' 128byte MFM sector bugaboo?
- don
Yes. It's a very nice 765 implementation. It can
handle single density
(I don't know off-hand whether they used a 37C65, or added extra logic),
can handle 4 drives, can operate at other addresses to permit use as a
second controller, etc.
But it's still a 765. As such, it can not do GCR, can't do hard sectors,
can't do MFM without WD style sector headers (AMIGA!), and can't even do
some WD MFM formats that start the first sector too early.
Allison could tell you EXACTLY what its capabilities and limitations are.
Fred, though I have never seen one, I have heard
that they made some of
the CCIVs with the National Semi FDC chips that were a bit more flexible
than the 765.
But those are still 765s, with the same basic capabilities and
limitations. The added flexibility might help with the "first sector"
issue, but it absolutely will NOT provide the RAW track read that would be
needed for reading Amiga, GCR, etc.