resurrecting a PDP-11/10

From: Ethan Dicks <>
Date: Tue Feb 25 18:54:01 2003

--- Tony Duell <> wrote:
> > --- pavl <> wrote:
> > (you DO have a second slu?)
> >
> > On a machine that old? Unlikely. Machines of the era before the
> > and especially machines that were not destined for timesharing, tended
> > to have few serial ports...
> Serial pots were used for things other than terminals... Many printers
> had serial interfaces, as did the TU58 (which is what started this
> discussion).

True, but serial terminals were not common when the PDP-11/10 was
being sold new. In the DEC world, it was the day of ASR-33s and
parallel line printers on the low end. Five years later, serial
printers were much more common (LA-36 and newer).
> While timesharing was rare on machines without memory managemnt, it was
> not uncommon to have 3 or 4 serial ports in such machines.

Again, my experiences in the DEC world are that Unibus RT-11-class
machines ( less than 28KW of RAM, one or two disk devices, no MMU )
tended not to have multiple DL-11s. I'm not saying it never happened,
it just wasn't common. It was much more common when the low end
switched to the Qbus platforms.

> Be warned that the DL11 (simple serial port) and the DZ11 (etc --
> 'multiplexer' serial ports) look very different in software! Older OSes
> may well only support the former.

True. Good call. I have never used a DZ-11 under any version of
RT-11 and have no idea how it would work out. I have used DZ-11s
with RSTS and RSX. Works great.

Received on Tue Feb 25 2003 - 18:54:01 GMT

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