5 Jun
2001
5 Jun
'01
7:22 p.m.
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
6 Jun
6 Jun
6:17 a.m.
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(a)cle.ab.com 216-266-6409
-----Original Message-----
From: owner-classiccmp(a)classiccmp.org
[mailto:owner-classiccmp@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
8600
days inactive
8600
days old
1 comments
2 participants
participants (2)
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engdahl＠cle.ab.com -
pete＠dunnington.u-net.com