Do we know the make/model of this drive?
- Original Message -
From: Marc Verdiell marc.verdi...@gmail.com
To: cctalk@classiccmp.org
Sent: Saturday, August 22, 2015 12:50 AM
Subject: RE: 5.25 floppies that read but don't
write
Chuck,
I looked at the pin 2 signal and resulting drive
Chuck,
I looked at the pin 2 signal and resulting drive behavior. It doesn't
properly auto-switch between densities as it should. It does switch it for
reading, but not for writing. Below is the full story.
There is one jumper that controls DD/HD switching mode.
In the auto position, I can read
On 08/21/2015 09:50 PM, Marc Verdiell wrote:
Chuck, I looked at the pin 2 signal and resulting drive behavior. It
doesn't properly auto-switch between densities as it should. It does
switch it for reading, but not for writing. Below is the full story.
On 5.25 HD drives, pin 2 is generally a
Thanks Chuck. Looks like you are on to something, I'll search in this
direction. Unlikely it has anything to do with the disks themselves, which
were blank. The 500 kHz write signal present on the connector just doesn't
make it to the head, whereas the 300 kHz does. On the other handm something
Re: Degaussing floppies.
Only part of degaussing a floppy is getting a strong enough degausser--I
use on made for wiping VHS carts--it gets very hot after only about 3
minutes of use and the thermal cutout belays my impatience until it
cools off. So it's definitely not wimpy.
However, to
Date: Thu, 20 Aug 2015 13:57:05 -0700
From: ccl...@sydex.com
To: gene...@classiccmp.org; classiccmp.org:On-Topic and Off-Topic Posts
cctalk@classiccmp.org
Subject: Re: 5.25 floppies that read but don't write
On 08/20/2015 01:04 PM, Marc Verdiell wrote:
So I tried to force
On Thu, Aug 20, 2015 at 9:01 PM, dwight dkel...@hotmail.com wrote:
If you are really interested in creating 360K disk, you must have a 360Kdrive.
And beyond that, sometimes trying to format or write to a 360K (48
TPI) disk in a 1.2M (96 TPI) drive does appear to work, and may even
appear to read
On 08/20/2015 01:04 PM, Marc Verdiell wrote:
So I tried to force formatting in DOS at 360k, and sure enough it
worked! I can then read the diskette back, write on it, etc... And of
course it failed formatting at 1.2 Mb. But the drive (Chinon FR-506)
is a 1.2M one, and reads fine at 1.2M! Any
@classiccmp.org
Subject: Re: 5.25 floppies that read but don't write
On 08/18/2015 09:05 PM, Marc Verdiell wrote:
I have connected a 1.2M 5.25 floppy to my computer. After a bit of
jumper learning and setting, it's recognized and reads my old DD and
HD floppies fine. But for the life
On 08/19/2015 09:10 PM, Fred Cisin wrote:
We also had some fun when the purchasing department gave us HD disks!
(for use in TRS80 model 1 SD) They would sometimes FORMAT, WRITE,
READ, and then minutes later, be blank again. The purchasing agent
was in bed with somebody peddling RoyType, and
eraser. Then when formatting, make sure you select the option to format
as a 360K.
It still may not read well on a 360K drive but that is life.
Dwight
Date: Tue, 18 Aug 2015 21:30:31 -0700
From: ccl...@sydex.com
To: cctalk@classiccmp.org
Subject: Re: 5.25 floppies that read but don't write
Just in case anybody was unaware, . . .
VERIFY is NOT a suitable test in this situation.
Most beginners assume that VERIFY will re-read the track, and determine
whether the write wrote the correct content. IT DOES NOT.
VERIFY checks the sector headers and CRCs, and determines whether there is
If reads go fine all around, but nothing will write, I'd be concerned that
the write electronics (write amp, etc.) might be defective.
But try Will'm D's suggestions, before taking that line, of course..
On Tue, Aug 18, 2015 at 11:12 PM, william degnan billdeg...@gmail.com
wrote:
Try swapping
I have connected a 1.2M 5.25 floppy to my computer. After a bit of jumper
learning and setting, it's recognized and reads my old DD and HD floppies
fine. But for the life of me I cannot write to it. Not under DOS, Win98, or
WindowsXP. Which all read fine.
But can't add a file. It goes through
Try swapping both a and b drives. Try with only 5 1/4 plugged in to a and
then again to b. Makes a difference?
Specify make and model of motherboard, drives. Describe cable. Describe
ROM settings.
Bill Degnan
twitter: billdeg
vintagecomputer.net
I have connected a 1.2M 5.25 floppy to my
On 08/18/2015 09:05 PM, Marc Verdiell wrote:
I have connected a 1.2M 5.25 floppy to my computer. After a bit of
jumper learning and setting, it's recognized and reads my old DD and
HD floppies fine. But for the life of me I cannot write to it. Not
under DOS, Win98, or WindowsXP. Which all read
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