PDP-11/53+ Jumpers

From: Jonathan Engdahl <engdahl_at_cle.ab.com>
Date: Wed Jun 6 13:17:39 2001

The M7554 has a Qbus on the A-B connector, and nothing but grant jumpers and
power on the C-D connector.

I don't know anything about 11/73's, but the first thing I noticed when I
got the 11/53 to boot was "Whoa! -- this thing is a lot faster than an
11/23".

Maybe Allison had better go looking for someone with a very fast "11/23" and
get his CPU board back!

--
Jonathan Engdahl???????????????? Rockwell Automation
Principal Research Engineer????? 24800 Tungsten Road
Advanced Technology????????????? Euclid, OH 44117, USA
Euclid Labs????????????????????? engdahl_at_cle.ab.com  216-266-6409
> -----Original Message-----
> From: owner-classiccmp_at_classiccmp.org
> [mailto:owner-classiccmp_at_classiccmp.org]On Behalf Of Pete Turnbull
> Sent: Wednesday, June 06, 2001 3:22 AM
> To: classiccmp
> Subject: Re: PDP-11/53+ Jumpers
>
>
> On Jun 5, 22:37, ajp166 wrote:
> > Isn't the 11/53 the box name and the cpu being either an 11/73
> > or 11/23B?  All the 11/53s I've seen had 11/23B cpus (M8189).
>
> No, an 11/53 processor is an M7554, which is a quad board with J11, half a
> meg of memory, 2 SLUs, bootstrap, etc.  It's rather like an
> 11/73B but with
> added memory (and no PMI capability, I think).  It was designed as a low
> end system, and IIRC it's slightly slower than an 11/73.
>
> If you saw 11/53 BA23's with 11/23's in them, someone swapped the
> cards, or
> swapped the labels.
>
>
>
> --
> Pete						Peter Turnbull
> 						Network Manager
> 						University of York
>

Received on Wed Jun 06 2001 - 13:17:39 BST