From: pete@dunnington.plus.com (Pete Turnbull)
Subject: [TUHS] pdp11 question
Date: Wed, 17 Nov 2010 23:36:38 +0000 [thread overview]
Message-ID: <4CE46706.40006@dunnington.plus.com> (raw)
In-Reply-To: <20101114095613.GA11157@freebie.xs4all.nl>
Wilko Bulte wrote:
> 11/73:
>
> http://www.chookfest.net/computers/pdp1173.html
Unfortunately a few things on that page are inaccurate. For example,
it's not exactly a PDP-11/83, it's really a microPDP-11/73, although the
memory has been rearranged as the writer stated. Both microPDP-11/73
and /83 use KDJ11-B, the difference being that the /73 used 15MHz parts
(as in that one) and the /83s which came later had 18MHz parts, and more
importantly they have different boot ROMs. However the other and
arguably most important difference between /73 and /83 systems is that
the /73s were originally set up with a normal QBus memory configuration,
whereas /83s use PMI memory with the memory in front of the CPU instead
of behind it. The boards in this one have been re-ordered, and although
having the CPU for a microPDP-11/73 it will mostly behave as a
slightly-slow /83.
KDJ11-A boards were used as upgrades for rack-based 11/23s and OEM
systems, not microPDP-11s. So the one on that page is close to its
original configuration, except for the Dilog SCSI controller and the
memory arrangement.
--
Pete Peter Turnbull
Network Manager
University of York
next prev parent reply other threads:[~2010-11-17 23:36 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-14 0:38 Tim Newsham
2010-11-14 1:03 ` Larry McVoy
2010-11-14 1:59 ` Warner Losh
2010-11-14 2:43 ` Pasquale Villani
2010-11-14 7:08 ` Greg 'groggy' Lehey
2010-11-14 9:56 ` Wilko Bulte
2010-11-17 23:36 ` Pete Turnbull [this message]
2010-11-14 22:22 ` Nick Downing
2010-11-15 0:17 ` Larry McVoy
2010-11-14 9:51 ` Wilko Bulte
2010-11-18 6:34 ` Lars Brinkhoff
2010-11-14 12:32 ` Pete Turnbull
2010-11-14 8:14 ` Jochen Kunz
2010-11-14 14:01 ` Pat Villani
2010-11-18 18:57 Norman Wilson
2010-11-18 19:26 ` Bill Pechter
2010-11-18 19:27 ` Carl Lowenstein
2010-11-18 21:03 ` Wilko Bulte
2010-11-29 23:05 ` Ian King
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