4 Aug
2004
4 Aug
'04
1:04 a.m.
Thanks for the info. I guess for this test I have to find a replacement
high-denisty drive. The drives in the unit are, apparently, high-density
drives but the disks are 360k disks made with another working system.
-----Original Message-----
From: Don Maslin [mailto:donm@cts.com]
Sent: Wednesday, August 04, 2004 12:41 AM
To: rcini(a)optonline.net; General Discussion: On-Topic and Off-Topic
Posts
Subject: Re: Teac floppy replacement
On Tue, 3 Aug 2004, Richard A. Cini wrote:
Hello, all:
I'm trying to get my "new" Micromint SB180 to work with
the floppy drives
that came with it. I've been given two sets of disks, both of which were
made on a known-working system but which produce read errors on mine.
The drives pass the internal disgnostics that are in the
SB180 ROM, but I
want to eliminate the drive from the problem by swapping another in. It
appears to use standard 5.25" 1/2-height PC drives except that the "old"
drive has a head-load solenoid while the new one doesn't.
The model number of the "old" drive is FD55F-03-U and the
model number of
the "new" drive is FD55BV-36-U. There are differences in the jumper
designations between the models so I can't readily map the settings.
Can anyone help with this? Thanks.
Rich, the 55F is a 96tpi drive while the 55BV is 48tpi. That
difference is likely the cause of your problem.
- don
Rich Cini
Collector of classic computers
Build Master for the Altair32 Emulation Project
Web site: http://highgate.comm.sfu.ca/~rcini/classiccmp/
/************************************************************/
8 Aug
8 Aug
7:06 a.m.
The 55F is a "720K" drive, NOT a 1.2M. 80 tracks, with 4 or 5 K
formatted on each track. 300 Oersted disks
Calling it "high density" (600 Oersted) might add to the confusion.
If your system disks that you are trying to use were written
with a 360K drive, then THAT is what you should try.
But,... be aware that a "720K" drive uses the same spec
of disks as a 360K. So, if all that you have to go on
is the manufacturer's label on the disks, then "360K"
could mean that they were recorded 360K, OR recorded 720K,
depending on drive.
On Wed, 4 Aug 2004, Cini, Richard wrote:
Thanks for the info. I guess for this test I have to
find a replacement
high-denisty drive. The drives in the unit are, apparently, high-density
drives but the disks are 360k disks made with another working system.
-----Original Message-----
From: Don Maslin [mailto:donm@cts.com]
Sent: Wednesday, August 04, 2004 12:41 AM
To: rcini(a)optonline.net; General Discussion: On-Topic and Off-Topic
Posts
Subject: Re: Teac floppy replacement
On Tue, 3 Aug 2004, Richard A. Cini wrote:
Hello, all:
I'm trying to get my "new" Micromint SB180 to work with
the floppy drives
that came with it. I've been given two sets of disks, both of which were
made on a known-working system but which produce read errors on mine.
The drives pass the internal disgnostics that are in the
SB180 ROM, but I
want to eliminate the drive from the problem by swapping another in. It
appears to use standard 5.25" 1/2-height PC drives except that the "old"
drive has a head-load solenoid while the new one doesn't.
The model number of the "old" drive is FD55F-03-U and the
model number of
the "new" drive is FD55BV-36-U. There are differences in the jumper
designations between the models so I can't readily map the settings.
Can anyone help with this? Thanks.
Rich, the 55F is a 96tpi drive while the 55BV is 48tpi. That
difference is likely the cause of your problem.
- don
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