Yes, that was one of the RTS compilers for the NU machine.  John Romkey may have done it, as he was the primary person behind PCIP, but I can not claim I remember who did the 8086 backend.  IIRC Jack Test did the 68K backend.  The RTS crew had the NU machine and NU bus that went with it.   Very tean project Neat project.  Similar idea, in fact to what CMU was doing with the Intel Mutlibus called the distributed front end (we had started with LSI-11 and cost reduced it to 8086 on a Intel Multibus).  Andy Bechtolsheim would take with him to Stanford and rework with a 68K which became the Stanford Network Terminal - which used the RTS's C compilers.   It's all very mixed up. [ Don't tell me there was not an open source culture back in the old days by the way].  

Anyway the MIT RTS foilks made hardware and PCC back ends for the 68K, Z8000 and 8086.  I believe that each had separate assemblers, tjt who sometimes reads this list might know more, as he wrote the 68K assembler.  IIRC they had a common linker which is was rewrite/extension to the original V7 linker or maybe the 4.1 linker.

Anyone with a V7 license could get it.   If you had a PC license you get get the source to Romkey's PCIP.   If you did not a license, you could only get a binary kit.

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On Tue, Apr 29, 2025 at 1:59 PM Rich Salz <rich.salz@gmail.com> wrote:

On Tue, Apr 29, 2025 at 1:00 PM Warner Losh <imp@bsdimp.com> wrote:

* IP/TCP for DOS (though this was an independent thing, done at MIT,
the licensing material for this product, IIRC, included some kind of
unix permission that confused me at the time, but it may have just
been lawyering to CYA rather than including anything).

The PC/IP software from MIT included a port of the "Portable C Compiler" to generate 8086-era code. It ran on a Unix machine and built binaries that you downloaded to the PC. So you need an ATT source license to get the full PCIP dev kit.