URGENT - DEC 11/83 (?) needs to be picked up this weekend (10 /9)

From: Pete Turnbull <pete_at_dunnington.u-net.com>
Date: Fri Oct 8 13:14:41 2004

On Oct 8 2004, 16:44, Gooijen H wrote:
> Correct.
> I have an 11/84 in 10.5" box (console at the right-hand side)
> and one 11/83 in 5.25" box (console in the middle of the front).
> The original poster is maybe not so "DEC-aware", but then again,
> I often doubt my DEC knowledge too.
> How much difference is obvious in just a glance at an 11/73 and
> an 11/83?

Without looking at the boards, it's impossible to tell for certain.
 Some 11/73s were upgraded without changing the badges on the front.
 *Usually* a microPDP-11/73 is in a BA23 and a microPDP-11/83 is in a
BA123, but not always. The real difference is in the use of normal
QBus versus PMI memory; that makes more difference to the speed than
just about anything else. Originally, an 11/73 would have had a 15MHz
KDJ11 and an 11/83 would have been 18MHz, so they'd have had slightly
different suffixes on the M-numbers, and they'd have slightly different
boot ROMs, but any of these things may have been changed. What an OS
goes by is whether the memory is PMI or not.

Pete						Peter Turnbull
						Network Manager
						University of York
Received on Fri Oct 08 2004 - 13:14:41 BST

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