[TUHS] Unix with TCP/IP for small PDP-11s

Henry Bent henry.r.bent at gmail.com
Sun May 21 03:39:26 AEST 2017

There is absolutely TCP/IP in Ultrix-11.  This is an emulated 11/23+:

hrb11# uname -a
ULTRIX-11 hrb11 3 0 PDP-11/23
hrb11# ifconfig qe0
qe0: netmask ffffff00
hrb11# netstat -rn
Routing tables
Destination     Gateway         Flags    Refcnt Use        Interface     UGH      0      0          qe0
192.168.1   U        1      0          qe0
default     UG       0      0          qe0
192.168.5     UG       0      0          qe0
hrb11# ftp
Connected to
220 aelfric FTP server (Version 6.4/OpenBSD/Linux-ftpd-0.17) ready.
Name (

It has trouble talking to the outside world, probably not a big surprise,
but works just fine on my local network.  I am working on getting it
installed in a real 11/23 but the Ultrix RL02 driver doesn't seem to like
my Dilog emulation board.


On 20 May 2017 at 06:46, Johnny Billquist <bqt at update.uu.se> wrote:

> On 2017-05-20 04:00, Warner Losh <imp at bsdimp.com> wrote:
> https://ia601901.us.archive.org/10/items/bitsavers_decpdp11u
>> lLTRIX112.0SPDSep84_870730/AE-X370C-TC_ULTRIX-11_2.0SPD_Sep84.pdf
>> Looks like it requires MMU, but not split I/D space as it lists the
>> following as compatible: M11, 11/23+, 11/24, 11/34, 11/40 and 11/60. It
>> does require 256kb of memory. See table 2, page 6 for details.
> Uh...? Where do you see that there is any TCP/IP support in Ultrix-11? If
> any was done by someone else, there is no saying that it would be usable on
> a machine without split I/D. To be honest, I've never seen any mention of
> TCP/IP on any machine without split I/D space. I guess it could be done,
> but it would be a rather big headache...
>         Johnny
> --
> Johnny Billquist                  || "I'm on a bus
>                                   ||  on a psychedelic trip
> email: bqt at softjar.se             ||  Reading murder books
> pdp is alive!                     ||  tryin' to stay hip" - B. Idol
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