SASI and XT/IDE info

[Ethan Dicks]

On Mon, Nov 26, 2007 at 05:54:21PM -0800, Fred Cisin wrote:
> On Tue, 27 Nov 2007, Ethan Dicks wrote:
> > There is one of those in the CBM 9060 and CBM 9090 drives.
> 
> So, . . .
> an IBM PC SASI board would let you cable a CBM 90x0 drive to a PC?
> THAT seems like a good use.
 
As long as the PC can handle 256-byte sectors...

The base drive in a CBM 90x0 is either a Tandon TM602S (9060/5MB) or
a Tandom TM603S (9090/7.5MB) - 4 heads vs 6 heads, MFM encoding,
32 sectors of 256 bytes per track.

But the CBM 90x0 "DOS board" _does_ speak SASI to a SASI<->ST506 board
that's also in there.  The geometry is fixed in ROM, though there have
been intrepid souls in the past few years who have dared to fiddle the
geometry table to get up to the filesystem max of 16MB per disk.

-ethan

-- 
Ethan Dicks, A-333-S     Current South Pole Weather at 27-Nov-2007 at 01:50 Z
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Ethan.Dicks at usap.gov            http://penguincentral.com/penguincentral.html