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

6 Jun 2001

On Jun 7,  0:36, Megan wrote:
...
  Pete Turnbull wrote: 
...
  >Allison, for once I feel you're wrong.  An
11/53 is a distinct processor 
...
  I don't think that was the point of what she was
saying... I think it
 was that although the *BOX* said 11/53, there was actually an 11/23
 plugged into the bus.  I can understand that might be the case nowadays,
 with all the moving of boards and such... but I cannot believe that
 DEC ever marketed a machine which said 11/53 which might contain an
 11/23 processor... someone surely would have noticed and had a problem
 with it... 
Megan, I agree with what you say about boards being moved around.   Of my
ten or so PDP-11 systems only three or four had the "right" processor when
I got them.  But I got the distinct impression Allison was (at least at one
stage) suggesting that (early) 11/53 systems were intended to have a
processor that wasn't a distinct member of the 11/x3 family.

Allison wrote:

...
  Isn't the 11/53 the box name and the cpu being
either an 11/73
 or 11/23B? 
Well, then it's not an 11/53 any more :-)

-- 
Pete						Peter Turnbull
						Network Manager
						University of York