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

Johnny Billquist bqt at update.uu.se
Sun May 21 06:40:49 AEST 2017

On 2017-05-20 20:18, Warner Losh wrote:
> On Sat, May 20, 2017 at 4:46 AM, Johnny Billquist <bqt at update.uu.se
> <mailto:bqt at update.uu.se>> wrote:
>     On 2017-05-20 04:00, Warner Losh <imp at bsdimp.com
>     <mailto:imp at bsdimp.com>> wrote:
>         https://ia601901.us.archive.org/10/items/bitsavers_decpdp11ulLTRIX112.0SPDSep84_870730/AE-X370C-TC_ULTRIX-11_2.0SPD_Sep84.pdf
>         <https://ia601901.us.archive.org/10/items/bitsavers_decpdp11ulLTRIX112.0SPDSep84_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...
> I read the sources to see the TCP/IP support was there (that's the bit
> about adding Berkeley Sockets). I see nowhere that it's excluded for the
> non I/D machines, but haven't tried it first hand. I got interested not
> because of the PDP-11, but because I have an old Rainbow that recently
> started running Venix (v7-based version) and was trolling around for
> some way to do TCP/IP to it (though w/o readily available ethernet
> cards, I'm not sure it is a viable project).

You do know that the Rainbow is not a PDP-11, right?


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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