27 Jul
2004
27 Jul
'04
3:37 p.m.
besides the fact that it isn't possible to read sd disks with a controller that can
only do dd..
so what does the diagnostic track read function of the 765 do (given that it is trying to
read dd data)?
-----Original Message-----
From: Fred Cisin <cisin(a)xenosoft.com>
Sent: Jul 27, 2004 11:01 PM
To: "General Discussion: On-Topic and Off-Topic Posts"
<cctalk(a)classiccmp.org>
Subject: Re: H89 disk imaging
On Tue, 27 Jul 2004, Dan Lanciani wrote:
Did you ever get this going? I'm looking at a
different approach, reading
the single density disks a track at a time in double density and then doing
the data separation in software.
A double density read with a PC FDC isn't going to work.
In fact, the NEC 765 type FDC (as is used in ALL of the PCs)
doesn't HAVE a track read; instead it has a "smart"
multi-sector read.
OTOH, if you use different hardware than a PC type FDC,
a track read of flux transitions can work.