<div dir="ltr"><div dir="ltr"><br></div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Tue, Jan 7, 2025 at 8:22 AM G. Branden Robinson <<a href="mailto:g.branden.robinson@gmail.com">g.branden.robinson@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">At 2025-01-07T09:42:14-0500, Douglas McIlroy wrote:<br>
> The PDP-7 of Unix v0 was a hand-me-down from Pinson's time in V&A. And<br>
> the PDP-11 of v1 was supported by a year-end fund surplus from there.<br>
<br>
Hi Doug,<br>
<br>
This seems to clarify something I'm a bit murky on in early Unix/nroff<br>
history, because I have read (and repeated, in groff's roff(7), the<br>
claim that revenue from internal AT&T deployments of nroff were a major<br>
aid to getting the CSRC on its feet hardware-wise. But that's in some<br>
tension with the story of Ossanna being able to deliver to the patent<br>
application typists a new line numbering feature in the (n)roff<br>
formatter "by tomorrow" if it was only after nroff's success that these<br>
revenues showed up.<br>
<br>
I also seem to remember from the preface to the v3 or v4 manual that the<br>
CSRC was trying to get itself and its Unix users everywhere away from<br>
the PDP-11/20 as fast as possibly, because that model didn't have memory<br>
protection.<br></blockquote><div><br></div><div>Yes. V1 and V2 ran on the 11/20 without an MMU, while V3 and later was the</div><div>port to the 11/45 with an MMU. I touch on these transitions in my history of unix</div><div>talk.</div><div><br></div><div>And I didn't know the connections that Douglas just relayed before my talk. It</div><div>would have made it more interesting to include. Unix has always been about</div><div>making it easier to collaborate and collaboration has a multiplier effect.</div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
I thus have these questions:<br>
<br>
What model of PDP-11 was v1 Unix developed and run on at the CSRC?<br>
<br>
What model did the CSRC acquire next? Specifically, which one did<br>
(n)roff make possible?<br></blockquote><div><br></div><div>I'd love to hear this info first hand too. I've delved and discovered what I</div><div>think the answers are, but I have no primary sources for them.</div><div><br></div><div>Warner</div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
Regards,<br>
Branden<br>
</blockquote></div></div>