PDP-11/53+ Jumpers - test-drb@ccmp.vtda.org

6 Jun 2001

From: Pete Turnbull &lt;pete(a)dunnington.u-net.com&gt;

...
 On Jun 6, 19:34, ajp166 wrote:
> I have a 11/73 and several 11/23s (some with clock mods for speed)
> so I'm aware of what I said.  MOST early 11/53 boxen actually had 11/23B
...
   cpu cards
(M8189). 
Allison, for once I feel you're wrong.  An 11/53 is a distinct processor
released a few years after the 11/73 and 11/83, as a low-cost option for 

What part of what I wrote is unclear?  The comment is most 11/53s I've
seen contained 11/23B cpus.  that maybe "not as shipped" but very
commonplace.

...
 office use.  When it was announced (1987), it was as a
J11 processor with
...
 separate I&D space and RAM on the processor card --
which no 11/23 has. I
...
 never heard of one having an 11/23 as shipped by DEC.

Never said it was.  I said many early 11/53boxen HAD 11/23s not they
shipped
with 11/23s.  Seems they were fertile ground for modified systems.

...
 It's listed in the 1987 PDP-11 Systems Handbook. 
Maybe Megan could look it
...
 up (I believe she has a copy?)? 

I have it.

Allison