[HECnet] PDP Ignorance

[Gregg Levine]

On Fri, Jul 15, 2011 at 1:13 PM, John Wilson <wilson at dbit.com> wrote:
From: "Steve Davidson" <jeep at scshome.net>

This is simple.   If the backplane has 2 slots per row then it is a QBUS
(/2 variant).   If it has 4 slots per row then it is also QBUS but could
be either 18-bit or 22-bit - the part number on the side of the
backplane will tell you for sure.   If the backplane has 6 slots per row
then it is UNIBUS.

In the wild this seems to be true, but the DDV11B (a hex-high Q-bus
backplane) existed at least in the minds of the handbook authors
(see p. 159 of Microcomputer Interfaces Handbook 1980).

John Wilson
D Bit


Hello!
John W, do you recall what sort of wire wrapping board you sent me? I
keep thinking its a typical Q Bus one, but is it?

-----
Gregg C Levine gregg.drwho8 at gmail.com
"This signature fought the Time Wars, time and again."