13 Jan
2002
13 Jan
'02
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