8 Dec
2007
8 Dec
'07
11:48 p.m.
-------------- Original message from Fred Cisin <cisin at xenosoft.com>:
--------------
On Sun, 9 Dec 2007 g-wright at att.net wrote:
And for the rest of the story .....................
This is on a MicroStar machine that runs StarDos. I know nothing about this
but from recent posts I decided to drag one of them down and look into it a
little further. This machine I have running is a Micro Five 1000 with a IMI
10 meg HD. It has a boot menu and back up Menu. It will still boot and
will make its own formatted floppies and back itself up with out much
problems. If I try to read one of the floppies with Image disk or Anadisk
they fail. It tried with both 360 and 1.2 meg drives. I would guess that
the drive in the machine is off enough to cause these problems . If I
install another floppy drive, the System picks up something and errors. So
there must be some other signal or ??? coming from the drive. The
machine date is in the 84 -85 range
The straps on the drive (M 4 x 3 2 1 H) are set with M and 1 jumpered
- thanks, Jerry
Hi
I have a machine with a 77711501 floppy drive and it's bad.. I have
tried 3 different 360k drives. I tried to find specs on it but so far have
not.
What is the difference between that drive and a
77711800 used in a PC
The computer just says there is a drive error. I'm using the same jumper
settings on both. I have also tried a Teac fd-55bv.
Is it a 320k drive ??
There ain't no difference.
320K drive and 360K drive are the same drive.
There is a way that it would be possible to build a drive that could do
320K, but not be able to do 360K, but nobody has done so yet.
Boot something other than WINDOZE. "Drive error" is not specific enough.
9 Dec
9 Dec
12:47 a.m.
Well, I can tell you that MPI made 100 tpi FH drives--I have two of
them on my shelf here, date codes are 81-82. Unfortunately, the
labels have dried up and dropped off, so I no longer have any idea of
what their part number is. I've also got a couple in another
machine, but it's a bear to get at them.
Does the drive have a little "daughterboard" plugged into the main
PCB with a 74ls123 on it? That'd be the "Drive Ready' circuit. I
don't know if all MPI 100 tpi drives had this though.
"Micropolis" type 100tpi drives also have a slightly different pinout
than normal "Shugart" type drives (this includes the Tandon TM-100-
4M). A big difference is that READY is pin 6, not 34. Maybe that's
what's causing your drive error.
Just guessing...
Cheers,
Chuck
1:20 p.m.
This is on a MicroStar machine that runs StarDos. I
know nothing about this
but from recent posts I decided to drag one of them down and look into it a
little further. This machine I have running is a Micro Five 1000 with a IMI
10 meg HD. It has a boot menu and back up Menu. It will still boot and
will make its own formatted floppies and back itself up with out much
problems. If I try to read one of the floppies with Image disk or Anadisk
they fail. It tried with both 360 and 1.2 meg drives. I would guess that
How do they fail? Can you read anything from any cylinder?
Do you have any reason to assume that the Micro Fice controller is a
normal MFM one? Some PCs can also read FM (single density) formats. But
if the Micro Five is GCR or something odd, no normal PC is going to be
able to read it.
If you can read something from cylinder 0, but it fails on other
cylinders, it might be a 100tpi drive (I thinkl cylinder 0 is in the
same place on both 100tpi and 96 tpi drives).
the drive in the machine is off enough to cause these
problems . If I
install another floppy drive, the System picks up something and errors. So
there must be some other signal or ??? coming from the drive. The
machine date is in the 84 -85 range
Doe the machine do anything with the replacement drive? Does it spin up,
do the heads seek?
The straps on the drive (M 4 x 3 2 1 H) are set with M and 1 jumpered
I am ownderign what hte 'M' jumper is. Is it 'multiplexed' -- that is,
'Enable the otuput drives all the time, so the controller can read the
drive status always'? I know some machines used that. It limits you to
one drive per cable, but it maeans you can reliabled use the write
protect signals as a start for a disk changed line, for example.
I don't suppose anyone has a sourve for service manuals for CDC/MPI
full-height 5.25" drives? I have an HP9826 going o nthe bench soon, the
drive in that is a CDC/MPI (HP badged, but the original labels are there
too). I really could do with a maechanical dismantiling/ reassembling/
alignment manual. There's an odd damper-like thing on the head carriage,
for example, which seems to be leaking grease.
-tony
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