there is a video on youtube about its & c-language demonstrating teco-'emacs'  and the c-compiler.

From: Lars Brinkhoff <lars@nocrew.org>
Sent: Tue, 19 Sep 2017 01:29:13
To: Clem Cole <clemc@ccc.com>
Cc: TUHS main list <tuhs@minnie.tuhs.org>
Subject: Re: [TUHS] PDP-10 UNIX?

Clem Cole wrote:
> ​There was a PDP-10 C compiler in the late 1970s, that was kicking
> around CMU, MIT and Stanford

When you say MIT, do you know if that was at the AI lab (i.e. ITS), or
elsewhere?