20 Jul
2005
20 Jul
'05
7:37 a.m.
Subject: BA123/RQDX3 floppy question
From: Brad Parker <brad at heeltoe.com>
Date: Wed, 20 Jul 2005 06:43:16 -0400
To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at
classiccmp.org>
I aquired an aged BA-123 a while back. It has an RQDX3 and the
interesting "distribution board" for the MFM disks.
The floppy (dual RX50) has a cable coming out of it which just hangs in
the air.
I'm guessing that some kind soul removed a card which some how connected
the floppy cable to the disk distribution board. I say this because at
the end of the BA-123 backplane there is a spacer and then two "qbus
like" slots. The bottom slot has the MFM disk distribution board
connected plugged into it and the top slot is empty.
Anyone have a clue about this?
I'll probably ditch the RX50 in favor of a stock PC 5 1/4" drive but
I'll still have to connect it to the RQDX3 somehow.
thanks!
-brad
That distribution board has a connector labeled RX50. The RQDX3 has a 50 pin
cable that goes to that disti board and from there you should have the usual
rats nest of 34pin (floppy), and 40/26pin (hard disks) from the distibrution
board to drives.
While your in there check the fans!
Allison
20 Jul
20 Jul
11:07 a.m.
On Wednesday 20 July 2005 06:37, Allison wrote:
>Subject: BA123/RQDX3 floppy question
> From: Brad Parker <brad at heeltoe.com>
>I'll probably ditch the RX50 in favor of a
stock PC 5 1/4" drive but
>I'll still have to connect it to the RQDX3 somehow.
Your cable from the RX50 should connect directly to the distribution
board... Also, you can't use a "stock" PC 5-1/4" floppy drive, you have
to either use a DEC drive, or a modified Teac FD-55GFR (aka an RX33,
google for "RX33" and "Teac" to find instructions on what jumpers to
change).
That distribution board has a connector labeled RX50.
The RQDX3 has
a 50 pin cable that goes to that disti board and from there you
should have the usual rats nest of 34pin (floppy), and 40/26pin (hard
disks) from the distibrution board to drives.
I think you mean 34/26pin for ST-506 interface hard disks. :)
Pat
--
Purdue University ITAP/RCS --- http://www.itap.purdue.edu/rcs/
The Computer Refuge --- http://computer-refuge.org
11:55 a.m.
On Wednesday 20 July 2005 10:21, Ethan Dicks wrote:
On 7/20/05, Patrick Finnegan <pat at
computer-refuge.org> wrote:
I was debating that, and forgot to verify what I'd typed before pressing
enter. Oh well, I made myself look foolish again. :)
Pat
--
Purdue University ITAP/RCS --- http://www.itap.purdue.edu/rcs/
The Computer Refuge --- http://computer-refuge.org
I think you mean 34/26pin for ST-506 interface
hard disks. :)
34/20? 
12:56 p.m.
Allison wrote:
That distribution board has a connector labeled RX50. The RQDX3 has a 50 pin
cable that goes to that disti board and from there you should have the usual
rats nest of 34pin (floppy), and 40/26pin (hard disks) from the distibrution
board to drives.
thanks! (I finally found a BA-123 manual also)
I have two other questions:
- can I pull out the distribution board and pop it into another QBUS, say
on an 11/23+?
- do I need the front panel 'thing' (the led board) or can I leave it
disconnected?
-brad
6938
days inactive
6938
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5 comments
4 participants
participants (4)
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ajp166＠bellatlantic.net -
brad＠heeltoe.com -
ethan.dicks＠gmail.com -
pat＠computer-refuge.org