20 Jul
2005
20 Jul
'05
8:32 p.m.
Subject: Re: BA123/RQDX3 floppy question
From: Pete Turnbull <pete at dunnington.u-net.com>
Date: Thu, 21 Jul 2005 00:54:51 +0100 (BST)
To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at
classiccmp.org>
On Jul 20 2005, 12:56, Brad Parker wrote:
Yes you do need the frontpannel disk insert. There is both write protect
and online functions. The alternate is just hard jumper it for enable
on both.
Allison
I have two other questions:
- can I pull out the distribution board and pop it into another QBUS,
say
on an 11/23+?
Yes, it needs power and ground (for the terminators and buffers) but
has no other connections to the backplane.
- do I need the front panel 'thing' (the
led board) or can I leave it
disconnected?
You need it. I can't remember if it's the READY line or the WR.PROT
that usually ends up in the wrong state otherwise, but one of them
needs to be there (the READY line has to be grounded, IIRC).
You can kludge it pretty easily. The layout and schematic for the
M9058 distribution board are on my web site, along with the schematic
for the LEDS-and-switches circuit.
http://www.dunnington.u-net.com/public/RQDX/