On Fri, Apr 9, 2021 at 10:41 AM Noel Chiappa <jnc@mercury.lcs.mit.edu> wrote:
 
The base software for the Cisco multi-protocol router was code done by William
(Bill) Yeager at Stanford (it handled IP and PUP); I have a vgue memory that
his initially ran on PDP-11's, like mine. (I think their use of that code was
part of the scandal, but I've forgotten the details.)
It might have been 11/20's, but I thought he had LSIs at that point (but I can be miss remember).    It was much more sophisticated and was really building a router, the CMU DFE was not.  We wanted a terminal mux.   So were primarily interested in telnet. As I mentioned to Lars in another thread, here is where I learned of  SUPDUP for some of the LISPers.   But we 

 

    > From: Tom Lyon

    > the design ... relied on CAD tools only extant on the Stanford PDP-10.

Sounds like SUDS?
Yes -- SUDS ran on the CMU-10s and 3-River's GDPs (through the FE) -- it was the CAD tool we used at CMU in the mid-late 1980s - the first tool I learned.