15 Feb
2006
15 Feb
'06
12:13 a.m.
I am wondering whether it is possible to replace the ailing Sony 3.5"
disc drives in both my HP9122D and HP9133H HP-IB units with PC 3.5"
drives?
These are the older Sony 3/4 height units with separate data & power
connectors, model OA-D32W-10 (double sided). The data connector has 26
pins. The power connector is standard 4 pin.
I located the pin-outs for these drives on a Japanese site, and found
that I could match all but 3 signals to a 'standard' 3.5" disc drive:
SONY OA-D32W-10 STANDARD
1 Motor On -----> 10 /MOTEA - 0=Motor Enable
Drive 0
2 Drive Select 0 -----> 14 /DRVSB - Drive Select 0
3 Disk Change -----> 34 /DSKCHG - 1=Disk Change/0=Ready
4 Drive Select 1 -----> 12 /DRVSB - Drive Select 1
5 Disk Change Reset -----> ????
6 Direction Select -----> 18 /DIR - 0=Direction Select
7 GND -----> GND
8 Step -----> 20 /Step - 0=Head Step
9 GND -----> GND
10 Write Data -----> 22 /WDATE - Write Data
11 GND -----> GND
12 Write Gate -----> 24 /WGATE - Floppy Write Enable,
0=Write Gate
13 GND -----> GND
14 Head Read -----> ????
15 GND -----> GND
16 Head Select -----> 32 /SIDE1 - 0=Head Select
17 GND -----> GND
18 Index -----> 8 /Index - 0=Index
19 GND -----> GND
20 Track 00 -----> 26 /TRK00 - 0=Track 00
21 GND -----> GND
22 Write Protected -----> 28 /WPT - 0=Write Protect
23 GND -----> GND
24 Read Data -----> 30 /RDATA - Read Data
25 GND -----> GND
26 Ready -----> ????
Is such a retro-fitting exercise possible? One possible problem could be
the rotational speed; I know the Sony drives spun at 600rpm as opposed
to the PC standard 300rpm... Any comments and/or suggestions about the
feasibility, as well as matching the signals of pins 5, 14, and 26?
Cheers
Glen.
15 Feb
15 Feb
4:51 p.m.
I am wondering whether it is possible to replace the ailing Sony 3.5"
disc drives in both my HP9122D and HP9133H HP-IB units with PC 3.5"
drives?
Personally, I think it would be a lot easier to repair the existing
drives. The main problem with these is that the grease on the eject
mechanism hardens, and the mechanism doesn't lock properly. If this is
not caught in time, then the upper head will catch in the disk shutter
when you eject the disk and will be ripped off the gimbal spring. If
that's happend you're looking for a new head assembly (been there, done
that).
The procedure for stripping down the drive has been posted here and on
http://www.hpmuseum.org/ many times in the past. Let me know if you want
me to go through it again...
If you have electronic faults, you might want to grab 'my' 9114A
scheamtics from http://www.hpmuseum.net (not the same site as above!). I
included diagrams for the 2 common versions of the PCB (FC9, FC16) and
the motor.
These are the older Sony 3/4 height units with separate data & power
connectors, model OA-D32W-10 (double sided). The data connector has 26
pins. The power connector is standard 4 pin.
I know them only too well!
I located the pin-outs for these drives on a Japanese site, and found
that I could match all but 3 signals to a 'standard' 3.5" disc drive:
SONY OA-D32W-10 STANDARD
1 Motor On -----> 10 /MOTEA - 0=Motor Enable
Drive 0
2 Drive Select 0 -----> 14 /DRVSB - Drive Select 0
3 Disk Change -----> 34 /DSKCHG - 1=Disk Change/0=Ready
4 Drive Select 1 -----> 12 /DRVSB - Drive Select 1
Be casreful. IIRC the double-sided Sony drives use a binary encoded
select scheme (i.e. they allow for 4 drives on the cable, selected by a 2
bit binary number, not the 1-of-n code used on almost all other drives.
This is clear from the schematics...)
5 Disk Change Reset -----> ????
This is an input to the drive. you might be able to ignore it.
6 Direction Select -----> 18 /DIR - 0=Direction Select
7 GND -----> GND
8 Step -----> 20 /Step - 0=Head Step
9 GND -----> GND
10 Write Data -----> 22 /WDATE - Write Data
11 GND -----> GND
12 Write Gate -----> 24 /WGATE - Floppy Write Enable,
0=Write Gate
13 GND -----> GND
14 Head Read -----> ????
There are many jokes based on confusion between 'L' and 'R' in Japanese.
It appears they may be based on fact. That pin is 'Head Load' (and yes,
these drives do have a head load solenoid).
15 GND -----> GND
16 Head Select -----> 32 /SIDE1 - 0=Head Select
17 GND -----> GND
18 Index -----> 8 /Index - 0=Index
19 GND -----> GND
20 Track 00 -----> 26 /TRK00 - 0=Track 00
21 GND -----> GND
22 Write Protected -----> 28 /WPT - 0=Write Protect
23 GND -----> GND
24 Read Data -----> 30 /RDATA - Read Data
25 GND -----> GND
26 Ready -----> ????
Is such a retro-fitting exercise possible? One possible problem could be
the rotational speed; I know the Sony drives spun at 600rpm as opposed
to the PC standard 300rpm... Any comments and/or suggestions about the
That's the major problem. You would have to modify the controller to run
at hald the data rate. Maybe the firmware would need modification too.
Personally, I'd think it would be a lot easier to repair the existing drive.
feasibility, as well as matching the signals of pins
5, 14, and 26?
-tony
6884
days inactive
6885
days old
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ard＠p850ug1.demon.co.uk -
Glen.Heiberg＠gijima.com