19 Nov
2003
19 Nov
'03
8:16 p.m.
I have an 8" drive that I intend to connect to a catweasel card for the
purpose of getting the bits off of a lot of old PT-DOS disks for my Sol
computer archive project. If I can accomplish that, then I'll extend my
Sol emulator to allow running PT-DOS on the emulator. Supposedly the
floppies have a lot of interesting stuff on them, including source code
to a lot of PT software.
After an hour of googling, I am unable to find what power to feed it.
The connector on the back is two 3-pin molex connectors and looks like this:
+-------+
| X X X |
+-------+
| X X |
+-------+
Yes, the middle one of the lower pair is missing. I assume the power is
+5, -5, +24, and GND, maybe +12 or -12 too. But guessing isn't good enough.
Does anybody know for sure what power to feed each pin? I have found
information on how to build a 34-pin to 50 pin cable to mate the 8"
drive to the catweasel, so I think I have what I need there.
Thanks for any help.
19 Nov
19 Nov
8:29 p.m.
Jim Battle wrote:
...
After an hour of googling, I am unable to find what
power to feed it.
The connector on the back is two 3-pin molex connectors and looks like
this:
+-------+
| X X X |
+-------+
| X X |
+-------+
Duh, I turned on my brain and buzzed out the connector to the PC board.
If I number the connectors like this
+-------+
| 1 2 3 |
+-------+
| 4 5 |
+-------+
Then 2, 4, 5 = GND, 3 = +5V regulated, 1 is > +12V unregulated.
That is, pin 1 goes to a 7812 regulator, pin 3 goes directly to +5 on
the digital logic, and the other three are grounds.
I've gotten so used to quickly finding things with google I forgot some
of the old fashioned techniques -- like figuring it out myself.
20 Nov
20 Nov
1:37 p.m.
On Wed, 19 Nov 2003, Jim Battle wrote:
Jim Battle wrote:
...
Jim, what make/model of 8" drive are you using? The most usual DC
power connection to one looks like the 'sketch' below. The AC
power to the motor is a separate connector.
POWER CONNECTOR FOR 8" DRIVE
DC Power Connector
view looking at rear of drive
____ ____
| o |_| o |
| 2 _ 1 |
| o | | o |
| 4 | | 3 |
| o | | o |
|_6__| |__5_|
Pin Volts Amperes
1 +24 1.7 max
2 +24 Return
3 -5 Return
4 -5 0.07 max
5 +5 1.0 max
6 +5 Return
- don
After an hour of googling, I am unable to find
what power to feed it.
The connector on the back is two 3-pin molex connectors and looks like
this:
+-------+
| X X X |
+-------+
| X X |
+-------+
Duh, I turned on my brain and buzzed out the connector to the PC board.
If I number the connectors like this
+-------+
| 1 2 3 |
+-------+
| 4 5 |
+-------+
Then 2, 4, 5 = GND, 3 = +5V regulated, 1 is > +12V unregulated.
That is, pin 1 goes to a 7812 regulator, pin 3 goes directly to +5 on
the digital logic, and the other three are grounds.
I've gotten so used to quickly finding things with google I forgot some
of the old fashioned techniques -- like figuring it out myself.
2:37 p.m.
IIRC, the Tandon TM848 has different power requirements and connectors
than the Shugart SA8xx drives. When I replaced one of my Shugarts with a
Tandon, I had to get a different connector, and supply at least one
different voltage.
There are a couple of cubic yards of stuff on top of my 8" drives, so I
can't check it now.
I think that I have the manuals for both Tandon 848 and Shugart 801; and I
think that I knbow where they are! Unfortunately, it's across town, on
one of the other campuses, and I won't be going there for a few weeks.
--
Grumpy Ol' Fred cisin(a)xenosoft.com
On Thu, 20 Nov 2003, Don Maslin wrote:
On Wed, 19 Nov 2003, Jim Battle wrote:
--
Fred Cisin cisin(a)xenosoft.com
XenoSoft http://www.xenosoft.com
PO Box 1236 (510) 558-9366
Berkeley, CA 94701-1236
Jim Battle wrote:
...
Jim, what make/model of 8" drive are you using? The most usual DC
power connection to one looks like the 'sketch' below. The AC
power to the motor is a separate connector.
POWER CONNECTOR FOR 8" DRIVE
DC Power Connector
view looking at rear of drive
____ ____
| o |_| o |
| 2 _ 1 |
| o | | o |
| 4 | | 3 |
| o | | o |
|_6__| |__5_|
Pin Volts Amperes
1 +24 1.7 max
2 +24 Return
3 -5 Return
4 -5 0.07 max
5 +5 1.0 max
6 +5 Return
- don
After an hour of googling, I am unable to find
what power to feed it.
The connector on the back is two 3-pin molex connectors and looks like
this:
+-------+
| X X X |
+-------+
| X X |
+-------+
Duh, I turned on my brain and buzzed out the connector to the PC board.
If I number the connectors like this
+-------+
| 1 2 3 |
+-------+
| 4 5 |
+-------+
Then 2, 4, 5 = GND, 3 = +5V regulated, 1 is > +12V unregulated.
That is, pin 1 goes to a 7812 regulator, pin 3 goes directly to +5 on
the digital logic, and the other three are grounds.
I've gotten so used to quickly finding things with google I forgot some
of the old fashioned techniques -- like figuring it out myself.
7897
days inactive
7897
days old
4 comments
3 participants
participants (3)
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cisin＠xenosoft.com -
donm＠cts.com -
frustum＠pacbell.net