17 Mar
2002
17 Mar
'02
7:33 a.m.
I just took a look at the docs for the Series 5 Altos
computers and
there is a repair ticket for a Mitsubishi M4853 Disk Drive. The floppy
disk summary docs indicate that drive is a 5.25, HH, 720K, 96
TPI drive.
Ok, not GCR, but I suppose similiar to drives used
in the Sanyo MB550 (or whatever that silver incompatible
was called).
The CP/M version with my Altos 580 is 2.2 Licensed
from Digital Research
by Lambda Software (4 disks.) Each of the six disks I have are labeled
double sided, double density, soft sectored. Of the two other disks, one
is for the 580-20 and is labeled MPM/CPM for Altos 580-20, the other
Altos Diags for model 580-x.
Hope this helps!
Can you make copies for Doc?
Regards,
-doug q
Douglas Quebbeman wrote:
Seagate ST225. So I
IIRC the Floppy on an Altos 580 is DSQD.
Am I correct that while different from standard
DSDD, they are *not* GCR drives?
What other machines might carry these drives, can I
hook one up to a standard PC controller in a box
running DOS, and then duplicate the disks?
> I had one that had the CMI hard drive replaced with a > know they will take similar configured Hard
Drives. I
think they will take
10, 15
and 20 Meg HDs.
This is good to know, ST225s still pop up from time to time...
-dq 
17 Mar
17 Mar
8:09 a.m.
I think you fellows may be woofing up the wrong tree. The normal DRIVE does
not determine what the modulation scheme is. GCR, MFM, FM, etc, are
modulation schemes. The drive simply takes what's sent to it and divides it
by two, thereby producing a single flux reversal for every positive transition
in the data stream. You can send it NRZ, Manchester, or RLL, or whatever you
like, but it will only take the data stream you send it and produce a flux
reversal for each positive transition. On read, if the data you sent it was
at the right frequency for the head/media combination, and had the minimal
number of transitions per unit of time, (that's why NRZ generally doesn't work
over time) you'll get back more or less what you sent it, less write
precompensation.
There are exceptions to these principles, but only in environments where the
system vendor chose to provide a non-standard drive, e.g. as Apple has, in the
past, chosen to do.
I can't tell you what the ALTOS 58x boxes do, since I gave mine to Will
Jennings some time back. That one had a CMI 32 MB drive in it, IIRC and a
96TPI (?) HH FDD.
Dick
----- Original Message -----
From: "Douglas Quebbeman" <dhquebbeman(a)theestopinalgroup.com>
To: <classiccmp(a)classiccmp.org>
Cc: "'Doc Shipley'" <drdidlittl(a)yahoo.com>om>; "'Marvin
Johnston'"
<marvin(a)rain.org>
Sent: Sunday, March 17, 2002 11:33 AM
Subject: RE: DSQD Drives (Was: RE: Diags/Boot image for Altos 580)
I just took a
look at the docs for the Series 5 Altos computers and
there is a repair ticket for a Mitsubishi M4853 Disk Drive. The floppy
disk summary docs indicate that drive is a 5.25, HH, 720K, 96
TPI drive.
Ok, not GCR, but I suppose similiar to drives used
in the Sanyo MB550 (or whatever that silver incompatible
was called).
The CP/M version with my Altos 580 is 2.2
Licensed from Digital Research
by Lambda Software (4 disks.) Each of the six disks I have are labeled
double sided, double density, soft sectored. Of the two other disks, one
is for the 580-20 and is labeled MPM/CPM for Altos 580-20, the other
Altos Diags for model 580-x.
Hope this helps!
Can you make copies for Doc?
Regards,
-doug q
Douglas Quebbeman wrote:
Seagate ST225. So I
IIRC the Floppy on an Altos 580 is DSQD.
Am I correct that while different from standard
DSDD, they are *not* GCR drives?
What other machines might carry these drives, can I
hook one up to a standard PC controller in a box
running DOS, and then duplicate the disks?
> I had one that had the CMI hard drive replaced with a > know they will take similar configured Hard
Drives. I
think they will take
10, 15
and 20 Meg HDs.
This is good to know, ST225s still pop up from time to time...
-dq 
8:45 a.m.
On Sun, 17 Mar 2002, Richard Erlacher wrote:
I think you fellows may be woofing up the wrong tree.
The normal DRIVE does
. . .
I can't tell you what the ALTOS 58x boxes do, since I gave mine to Will
Jennings some time back. That one had a CMI 32 MB drive in it, IIRC and a
96TPI (?) HH FDD.
Whether the drive is HH (HALF-HEIGHT) of FH (FULL-HEIGHT) is ALSO woofing
up the wrong tree.
10:52 a.m.
On Sun, 17 Mar 2002, Douglas Quebbeman wrote:
Doug, it is a pretty conventional CP/M format. The disk definition is
in the list from 22Disk.
- don
I just took a
look at the docs for the Series 5 Altos computers and
there is a repair ticket for a Mitsubishi M4853 Disk Drive. The floppy
disk summary docs indicate that drive is a 5.25, HH, 720K, 96
TPI drive.
Ok, not GCR, but I suppose similiar to drives used
in the Sanyo MB550 (or whatever that silver incompatible
was called). The CP/M
version with my Altos 580 is 2.2 Licensed from Digital Research
by Lambda Software (4 disks.) Each of the six disks I have are labeled
double sided, double density, soft sectored. Of the two other disks, one
is for the 580-20 and is labeled MPM/CPM for Altos 580-20, the other
Altos Diags for model 580-x.
Hope this helps!
Can you make copies for Doc?
Regards,
-doug q
Douglas Quebbeman wrote:
Seagate ST225. So I
IIRC the Floppy on an Altos 580 is DSQD.
Am I correct that while different from standard
DSDD, they are *not* GCR drives?
What other machines might carry these drives, can I
hook one up to a standard PC controller in a box
running DOS, and then duplicate the disks?
> I had one that had the CMI hard drive replaced with a > know they will take similar configured Hard
Drives. I
think they will take
10, 15
and 20 Meg HDs.
This is good to know, ST225s still pop up from time to time...
-dq
8164
days inactive
8164
days old
3 comments
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