field maintenance print sets

From: Chuck McManis <>
Date: Thu Aug 12 16:00:02 1999

At 08:10 PM 8/12/99 +0000, Lawerence wrote:
>Also, I saw what I swear must be a quad height pdp8 board. He wasnt
>sure what it was, so he wouldnt let me have it yet. He thought it
>might be a PDP11 board (did they make quad height PDP11 systems?).
>Heres what the board says:
> Excelan
> Exos 204 s/n 001993

DEC used the same basic connector on its first three busses (OMNI, UNI, and
Q). and they evolved from the connector they used on the Flip chip chards.
PDP-8 boards are :
        1 "high" - Straignt 8, 8/I, 8/L, 8/S
        4 "high" - 8/E/F/M
        6 "high" - 8/a

PDP-11 boards come in two flavors Unibus and Q-bus the are either 2 high,
four high, or six high. Generally only Unibus and PDP-8/a boards are 6
high. (I don't think they ever made a Q22/CD/EF backplane.)
Received on Thu Aug 12 1999 - 16:00:02 BST

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