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From: jnc@mercury.lcs.mit.edu (Noel Chiappa)
Subject: Re: [TUHS] 2.9bsd with networking on 18-bit possible?
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PS:

    > IIRC, outbound packets are copied into kernel buffers

IDRC; according to the documentation, outbound packets are DMA'd directly from
user memory. I have yet to read the code to verify this.

    > we must have added PTY's of some sort

There is indeed a PTY driver; it has comments from BBN'ers who edited it, so
perhaps we got it from BBN.

    > I don't remember which one SMTP used.

The 'simple' TCP.

    > The whole thing worked _really_ well. Alas, I don't think anyone else
    > picked up on it.

So I found a long list of people we sent tapes to. Oh well....

    > The kernel code is not that large, it should even run on a /40, without
    > overlays (although the number of disk buffers would probably get hit).

Well, maybe... Here is the output of 'size' on the last Unix image for that
machine:

   40560+3098+44594

It was a /45, so split I/D (no overlays, though). How much could be trimmed
out of that, I'm not sure.

    Noel