2 Aug
2009
2 Aug
'09
11:07 p.m.
Based on the ten BA23 boxed PDP11 examples in my collection I'd say Pete was
spot on
Regards
Rod Smallwood
-----Original Message-----
From: cctech-bounces at classiccmp.org [mailto:cctech-bounces at classiccmp.org]
On Behalf Of Pete Turnbull
Sent: 02 August 2009 13:25
To: General Discussion: On-Topic and Off-Topic Posts
Subject: Re: I'm sure someone has info on this...
On 02/08/2009 10:22, tiggerlasv at aim.com wrote:
One can't really tell much without opening the back panel,
but I will make a guess based on the photos provided in the auction
listing,
and typical system configurations from the period.
It would appear that this is a PDP-11/23+ system.
You mean a "microPDP-11/23". A PDP-11/23plus would be in a BA11-S box.
Same processor board, though, but very different boot ROMs.
This is based on the basic "Micro PDP-11"
medallion on the front panel,
and the 2-port cab-kit, which is standard for the 11/23+ only.
The badge could be any of the microPDP-11 series, as far as I can see.
But it is a 2-port cab kit -- well spotted (on single-port ones the baud
rate legend and selector are in the middle, with the DB25 at one end and
the LED displays at the other) so unless it's been upgraded this is a
KDF11 system, not a KDJ11.
I see two 4-port cab-kits on there, which, based on
the era
is most likely a DHV11, but it could be a pair of DZV11's as well.
Could even be a couple of DLV11-Js, though that's less likely.
There is a lone connector in one of the "A"
slots,
which could be just about anything. It sort of looks like
the LPV11 cabinet kit with the 37-pin connector,
but that is just speculation.
Could be; I thought about a DLV11-E or a DPV11, but the connector looks
too big for those. Maybe a TQK25 kit, I can't remember what the
connector on those was.
The RX50's tell you that there should be an RQDXn
controller
installed (most likely an RQDX2) which might also indicate
the presence of an RD52 or RD53 disk drive behind the front bezel.
If it were an 11/23 variant it would much more likely be an RQDX1, but
that's very similar.
--
Pete Peter Turnbull
Network Manager
University of York