Odd DEC panel available.

[Jim Beacon]

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!)
>
>