6 Nov
2001
6 Nov
'01
11:44 a.m.
Both MFM and M2FM use the same sort of clock/data separation logic, according to
what I've been able to find out. That WD178x series used some sort of
separately advertised/supported clock extraction circuit so I've been unable to
progress beyond that point as far as establishing whether it would also do MFM.
You might check with Eric Smith, as he's got some M2FM stuff to read eventually.
He may have the info.
Dick
----- Original Message -----
From: "Fred Cisin (XenoSoft)" <cisin(a)xenosoft.com>
To: <classiccmp(a)classiccmp.org>
Sent: Tuesday, November 06, 2001 6:22 PM
Subject: M2FM (was: ISIS & CP/M for MDS 225 series3
On Tue, 6 Nov
2001, Allison wrote:
> Standard CP/M on 8" is the right bios but.... The right media
> as the MDS controller was SD/D2... single density(normal ibm
> 128 byte sectors) and D2 was double density by m2fm and
> incompatable with everything except Intel. So you need
> another working intel box user.
On Tue, 6 Nov 2001, Don Maslin wrote:
I am told that a WD1793 based controller can read
M2FM. Have not tried
it myself, though. Did not Altos use such a format with their MP/M
disks?
Although they may have had many more unique formats than I'm aware of, I
have seen quite a few Altos MP/M diskettes that were very ordinary 96TPI
MFM, (and readable with a 765)
Does anyone have a good refernce to the internal details of M2FM?
--
Fred Cisin cisin(a)xenosoft.com
XenoSoft http://www.xenosoft.com
PO Box 1236 (510) 558-9366
Berkeley, CA 94701-1236
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