24 Nov
2017
24 Nov
'17
8:22 a.m.
On 2017-11-24 2:02 AM, Chuck Guzis via cctalk wrote:
On 11/23/2017 07:02 PM, Paul Berger via cctalk wrote:
My old Compaq system has one of these drives in it so I pulled out out
to take a look and yes it should work however the signal cable connector
is on the left looking at the back which is the opposite of where it is
on the Sony and YE Data drives.? The signal cable inside the 9122C is
pretty tightly folded and it would require modification if you wanted to
put the drive in the right bay but should be ok in the left one.
I also got a Panasonic JU-257A606P to work once I noticed the head
stepper was unplugged.? This drive apparently has versions with switches
on the board to change the configuration.? The drive I have does not
have these switches but wire jumpers on the pad work just as well.? This
drive also has the signal connector on the left.
Forgot to mention that the 9122C uses select 0 for the first drive
normally the left one, ? and select 3 for the second drive.? Most newer
drives do not have a provision for using select 2 or 3 and indeed since
many are aimed at the PC market they are hard wired for select 1.? I
just remapped the select pin in my case connected pin 6 on the cable
(select 3) to pin 12 on the drive (select 1).? Unless your drive can be
set up for power on the signal cable like the original Sony drive, you
will need some kind of an interposer between the cable and drive anyway,
and it is easy to remap pins there.
Paul.
I have managed to get 2 PC type drives working in
a 9122C they are two
different versions of the YE Data YD-702D.? The important thing is the
drive needs to provide a ready signal, diskette change and density.
Most drives provide the last two but do not have a ready signal.? You
also need to leave pin 1 unconnected this is a signal from the
controller to reset the diskette changed signal.? One of the drive the
YD-702D-6037 can also be altered by moving jumpers to get power from the
cable.? The other a YD-702D-6537D does not and it unfortunately seems to
be the more common drive.? I changed the drives so that ready is on Pin
34, diskette change on pin 2 and density on pin 4, the same as the Sony
drive in the 9122C.? I did encounter one problem where if I tried to CAT
a diskette it would always report that the diskette was changed or
missing and I recall encountering this previously, it may be related to
how the diskette changed signal gets reset. On most "standard" 3.5"
drives the diskette changed signal gets reset as soon as the drive is
selected and receives a step pulse. On the Sony drives used in the 9122C
reset the diskette changed signal by a pulse on pin 1 from the
controller.? What I think is happening is when media is changed, the
controller thinks it does not have to move the head so the diskette
changed never gets reset so the controller continues to think the
diskette has been changed, I will do more testing to verify.? I thought
that booting with the drive empty provoked this but that is not the
case.? I can post details of the modifications to the drives if anyone
is interested.
In cases like this, I fall back to my favorite--the Samsung
SFD-321B:
http://www.techtravels.org/wp-content/uploads/pefiles/SAMSUNG-SFD321B-07010…
Plenty of them in the wild and very configurable. In most of my cases,
pin 34 is ready, pin 2 is Disk changed, DS0 is assumed and the spindle
speed is 360 RPM.
You can get them readily in black or white faceplates or even
faceplate-less.
FWIW,
Chuck