[TUHS] PDP-11 questions
pete at dunnington.plus.com
Tue Jan 26 02:18:06 AEST 2016
On 25/01/2016 11:29, Tony Finch wrote:
> Norman Wilson <norman at oclsc.org> wrote:
>> It worked both ways, of course. I too suspect that a
>> majority (though I'm not so sure about `vast') of PDP-11s
>> never ran UNIX.
> A random vaguely off-topic example: in Cambridge a PDP-11 was used as a
> terminal multiplexor for the IBM mainframe.
The University of Leeds did something similar - an 11/34 with a lot of
Emulex serial lines and an RX02 to boot from, was connected to their
Amdahl. I remember the RX02 particularly because when we decommissioned
it and took out the floppies, both had completely transparent rings on
or near track zero, so it obviously had been left running and not
rebooted in quite some time. In the same machine room there were two
third-party cabinets with KDJ11A CPUs, more serial lines and IBM channel
interfaces. They also had at least one DX11.
The University of Edinburgh used several small PDP-11/23s in BA11-N
boxes as terminal/network concentrators for EMAS. I can't remember how
they worked but I remember they had one sync serial interface and a
bunch of DLV11-Js.
More information about the TUHS