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

Johnny Billquist bqt at update.uu.se
Sun May 21 07:34:30 AEST 2017

On 2017-05-20 23:05, Warner Losh wrote:
> On Sat, May 20, 2017 at 2:40 PM, Johnny Billquist <bqt at update.uu.se
> <mailto:bqt at update.uu.se>> wrote:
>     On 2017-05-20 20:18, Warner Losh wrote:
>         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?
> Only since '84 when I bought mine... They are both small memory boxes,
> though, and something that can run in a 256kB machine should be able to
> run on a 892kB machine...  I have bits of mch.c/low.s from Venix that I
> can leverage for the port to the Ultrix kernel to the 8088 that's inside
> the Rainbow it would be running on.

Good. Just wanted to make sure you wouldn't get surprised/confused 
later. :-)
No offense intended.

That said, I suspect it is not that easy to move over, as this probably 
ties very closely in to how the hardware works, and more specifically 
the MMU. Thus, an 8088 have to do things rather differently than a PDP-11.


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

More information about the TUHS mailing list