On Sat, May 20, 2017 at 4:46 AM, Johnny Billquist <bqt@update.uu.se> wrote:

On 2017-05-20 04:00, Warner Losh <imp@bsdimp.com> wrote:

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).

Warner