Sounds a little like the panels on the top of our old DX11 units, which went
from PDP11/45 to IBM 9020. The included a whole bunch
of Flip Chip logic
panels, as well as various Unibus repeater and driver cards.
Still have one
of the indicator panels somewhere (probably still have a couple of DX11's at
work.....)
Jim.
----- Original Message -----
From: "Bob Shannon" <bshannon at tiac.net>
To: "General Discussion: On-Topic and Off-Topic Posts"
<cctalk at classiccmp.org>
Sent: Wednesday, April 06, 2005 11:17 PM
Subject: Odd DEC panel available.
This turned up while I was collecting some indicators
for a control panel
project.
But this might be something that should not get chopped up, and I'm not
quite sure
what this is (was).
Its a 19 inch wide, rack mount panel with a 36-bit indicator register
using
Dialco 507-3917 incandescent lamps (5 are missing).
There are also 4
toggle
switches (one dammaged).
The panel itself is .250" thick plate, painted grey with hand-written
labels
written
on masking tape.
Behind the panel there are two (DEC) 4918 18-bit Indicator boards with
transistor
drivers and connectors for logic and power. Spade lugs supply the power
while
a single-finger 'unibus-like' female edge connector is used for the logic
signals.
The toggle switches are connected by multi-couductor flat cable (not
modern
ribbon cable) to a 3-66 PERFORATED BOARD W994A, which
is a single
finger 'unibus-like' male edge card connector.
It gets more interesting when I read the handwritten labels above the
indicators.
From left to right, they read:
A sel
B sel
Restart
IOT GO
PA PIR 1 thru 7
PB PIR 1 thru 7
P0
P1
RD RQ
WR RQ
META STP
META ERR
(blank)
PU 1
P1
(blank)
FLAG
PIA PDP-6 (3 lamps)
10 FLAG
PIA PDP-10 (3 lamps)
I'm guessing this was part of some PDP-10 to PDP-6 interface kludge made
from DEC logic modules. Is this part of some well-known kludge, it
probably
came from MIT's surplus equipment exchange back in the mid 1980's, but
its clearly much older than that.
Is this something someone wants, or should it be canabilized?
( I gotta Google on a PDP-6, I dunno that one, but I know what a -10 is!)