[TUHS] Unix with TCP/IP for small PDP-11s
imp at bsdimp.com
Sun May 21 07:05:29 AEST 2017
On Sat, May 20, 2017 at 2:40 PM, Johnny Billquist <bqt at update.uu.se> wrote:
> 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:
>> Looks like it requires MMU, but not split I/D space as it lists
>> 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
>> 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.
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