28 Feb
2003
28 Feb
'03
7:14 a.m.
On Feb 28, 10:23, Jochen Kunz wrote:
from
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On 2003.02.28 07:00 Stuart Johnson
wrote:
Jonathan, what I want to know is how do you
connect the RX50 and
RD(whatever) hard drive to the RQDX3?
There are different distribution panels that
split the 50 pin cable the RQDXx. The M9058 dist panel for the BA123 looks
like a double
QBus
card and sits in "QBus slot 13" in the
BA123. The BA23 dist panel is
mounted inside the enclosure on the back of the QBus backplane. I
have
the wiring of this panel, I can mail it to you when
you want to build
your own dist panel. There is a BA213 dist panel that replaces the
front
panel in a BA213 and has some additional switches LEDs
to reset the
CPU
etc. I think it is not that easy to rebuild this.
It's not that hard to make something that will work. The distribution
panels that split up the signals from the RXDX1/2/3 boards to connect
to RDxx or RX50 are mostly just rerouting signals (some include some
buffering). I've made up two of my own; one simple one, on Veroboard
(stripboard), and one as a PCB. If you look in
http://www.dunnington.u-net.com/public/RQDX/
you'll find the PCB layout and component overlay, along with the RQDX
pinouts, for the larger of the two I made. It includes provision for
switches or jumpers to do the job of the front panel switches. The
circuits for the switches, inbcidentally, are very simple -- a latching
switch, LED, one transistor (to invert the signal, as I recall) and a
few resistors. It needn't even be as complex as that.
I once traced out and re-drew the schematic of the M9058 board, but I
can't find the PostScript file now :-( If I ever do, I'll post it on
the website as well.
--
Pete Peter Turnbull
Network Manager
University of York