13 Jan
2002
13 Jan
'02
5:57 p.m.
I just got a pair of SSDD 8" Control Data disk drives, and was wondering
if anyone had any information about them. Here's the info I can figure
out from the drive:
1) Spindle motor has a 3 pin molex connector, is rated 120V, 0.77A at 60Hz
2) 2pin next to a 4pin power connector 'J7' on the logic board
3) 50pin data connector (Can't be scsi, can it?)
4) empty 16pin DIP socket
5) 8 switch DIP switch
"Magnetic Peripherals Inc. a subsidiary of CONTROL DATA CORPORATION" label
with 120V ratings:
Equip. Ident. No. BK8A2A (could be BR8A2A)
Series Code 09
Part Number 75744025
Serial Number 127888
Label on opposite side:
Flexible Diskette Driver
Educational Computer Corp
Orlando, Floriday
MFG PART NO: 910024000-009
MFG SERIAL NO: 127888
There's a bunch more numbers stamped on the drive pieces, but I'm
guessing that they won't be of much use unless I want to build a new drive
from scratch (after getting in a time machine to go
back 20-25 years).
Thanks for the help!
-- Pat
13 Jan
13 Jan
6:59 p.m.
Most CDC drives are just garden-variety 8" drives.
No, they're not SCSI. They require a controller not unlike what's in a PC,
and, in most cases, can be used with some cabling, etc, to work with a few
different software packages that may or may not still be available.
What did you wnat to do with the drive? Do you have an application?
Dick
----- Original Message -----
From: "Pat Finnegan" <pat(a)purdueriots.com>
To: <classiccmp(a)classiccmp.org>
Sent: Sunday, January 13, 2002 4:57 PM
Subject: 8" Disk drives
I just got a pair of SSDD 8" Control Data disk
drives, and was wondering
if anyone had any information about them. Here's the info I can figure
out from the drive:
1) Spindle motor has a 3 pin molex connector, is rated 120V, 0.77A at 60Hz
2) 2pin next to a 4pin power connector 'J7' on the logic board
3) 50pin data connector (Can't be scsi, can it?)
4) empty 16pin DIP socket
5) 8 switch DIP switch
"Magnetic Peripherals Inc. a subsidiary of CONTROL DATA CORPORATION" label
with 120V ratings:
Equip. Ident. No. BK8A2A (could be BR8A2A)
Series Code 09
Part Number 75744025
Serial Number 127888
Label on opposite side:
Flexible Diskette Driver
Educational Computer Corp
Orlando, Floriday
MFG PART NO: 910024000-009
MFG SERIAL NO: 127888
There's a bunch more numbers stamped on the drive pieces, but I'm
guessing that they won't be of much use unless I want to build a new drive
from scratch (after getting in a time machine to go back 20-25 years).
Thanks for the help!
-- Pat
7:24 p.m.
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8:55 p.m.
Did the CDC/MPI Hardware Maintenance Manual include the jumper options and
setup details? I recall that the Mitsubishi, Shugart, and Qume maintenance
manuals didn't, and the Siemens, though they showed the various circuits,
didn't explain what they did. The one most often needed is the OEM manual.
That's the one with the installation and setup data, as well as the spec's.
Those are lots more common than the maintenance manuals as well.
If you need the maintenance manual, you're in BIG trouble, particularly if you
haven't got it.
Dick
----- Original Message -----
From: "Tony Duell" <ard(a)p850ug1.demon.co.uk>
To: <classiccmp(a)classiccmp.org>
Sent: Sunday, January 13, 2002 6:24 PM
Subject: Re: 8" Disk drives
I just got a pair of SSDD 8" Control Data disk drives, and was wondering
if anyone had any information about them. Here's the info I can figure
out from the drive:
How many people can guess my next statement? Yes ...
I have the 'Hardware Maintenance Manual' for that series of drives.
1) Spindle motor has a 3 pin molex connector, is rated 120V, 0.77A at 60Hz
2) 2pin next to a 4pin power connector 'J7' on the logic board
3) 50pin data connector (Can't be scsi, can it?)
4) empty 16pin DIP socket
5) 8 switch DIP switch
"Magnetic Peripherals Inc. a subsidiary of CONTROL DATA CORPORATION" label
with 120V ratings:
Equip. Ident. No. BK8A2A (could be BR8A2A)
Series Code 09
Part Number 75744025
Serial Number 127888
OK, that's Model Number (Equipment ID) BR8A2A, Part nymber 7574025.
Therre's a table in the manual. That version has a daisy-chain interface
(like most floppy drives), with internal data separator, etc, 120V, power
requirements +24V and +5V at J7.
The pinout of the 50 pin interface connector is similar to that on the
Shugart SA800 series. It's nothing like SCSI -- it's a 'raw' interface,
carrying the bit stream to/from the read/write circuit. It's up to the
controller to turn that into bytes, etc.
Anyway, the pinout is :
1-49 (odd numbers) : ground
2 : Read Data Composite
4 : Head Load
6 : Track 00
8 : Index
10 : Low Current
12 : Step
14 : Direction
16 : Write Enable
18 : Write Data
20 : Unit Select 1
22 : Unit Select 2
24 : Unit Select 3
26 : Unit Select 4
28 : Ready 1
30 : Ready 2
32 : Ready 3
34 : Ready 4
36 : Write Protect
38 : Read Data Separated
42 : Clock Separated
44 : Write FaultB
46 : Write Fault Reset
The power connector (J7) has the following pinout :
1 : Not Used
2 : +5V
3 : Ground (+5V return)
4 : +24V
5 : Pin Missing
6 : Ground (+24V return)
7 : Not Used
-tony
14 Jan
14 Jan
1:34 p.m.
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3:06 p.m.
THe trouble comes in trying to bind the requirements outlined in many disk
controller manuals with the jumpering schemes on one drive type, often not the
one you have, to the meaning of those jumpering option so you can translate
that into equivalent jumpering on another drive type not on the list of drives
for which there are jumperings specified by the controller manufacturer. The
defaults tend, generally, to be equivalent, but the various controller makers
tended to opt for configurations that made their particular controller work
better, or what they so deemed, than some other controllers. This can lead to
severe confusion if the "definitions" of those options are not characterized.
Once some drives started using microcontrollers or other LSI's for their
devices, things became murkier. Often it was possible to divine what a given
jumper was supposed to do by looking at the similarly named jumper on a
previous model of drive, but that didn't always work.
more below ...
Dick
----- Original Message -----
From: "Tony Duell" <ard(a)p850ug1.demon.co.uk>
To: <classiccmp(a)classiccmp.org>
Sent: Monday, January 14, 2002 12:34 PM
Subject: Re: 8" Disk drives
you
>
> Did the CDC/MPI Hardware Maintenance Manual include the jumper options and
> setup details? I recall that the Mitsubishi, Shugart, and Qume
maintenance
Sort-of. It tells you which of the factory-set jumpers are fitted for
each version of the logic board. It also points you to the right page of
the schmatics for setting things like the drive select jumpers.
> manuals didn't, and the Siemens, though they showed the various circuits,
> didn't explain what they did. The one most often needed is the OEM
manual.
> That's the one with the installation and
setup data, as well as the
spec's.
On these drives, the logic is almost all simple TTL. It's easy to work
out what most of the jumpers do from the schematics (which are in the
maintenance manual). To be honest I'd rather have the schematics (from
which I can work out the jumper settings) than a table of jumper settings
(from which I can't work out the schematics).
The really annoying ones at the modern-ish Teac manuals. On those drives
there's one big ASIC for everything. Jumpers just connect pins of it
together, or pins of it to external connector pins. So it's impossible to
work out what they do, even with the schematics. And Teac don't include
the jumper table in the manual.
Well, they do LIST the jumpers, but they don't tell you what they're
intended
to do for you.
Those are lots more common than the maintenance manuals as well.
I've never seen the OEM manual for any of the drives I work with. I've
seen references to it in the maintenance manaul, so it must have existed,
but the maintenance manuals are a lot more common over here.
>
> If you need the maintenance manual, you're in BIG trouble, particularly if
haven't
got it.
Well, most electronic faults are not hard to put right on these drives
given the schematics....
-tony
8385
days inactive
8386
days old
5 comments
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ard＠p850ug1.demon.co.uk -
edick＠idcomm.com -
pat＠purdueriots.com