Marc is correct. All of ISC C compilers were based
on Bell Labs C compilers, starting with a C compiler
for the DEC VAX machine in 1978.

Heinz

On 3/7/2024 4:30 PM, Marc Rochkind wrote:
> Larry & Dave, thanks for jogging my memory. I'm pretty sure it was BDS 
> C on that z80 Zenith computer. (See my longer post above.)
>
> I should add that around 1984 I got a copy of PC/IX for the IBM XT, 
> directly from Interactive Systems in Santa Monica, where I knew a few 
> people. That was true UNIX, System III, I think, and I used it for all 
> of the examples for my book "Advanced UNIX Programming," which came 
> out in 1985. It, of course, had a real Bell Labs C compiler.
>
> Marc
>
> On Thu, Mar 7, 2024 at 5:15 PM Charles H Sauer (he/him) 
> <sauer@technologists.com> wrote:
>
>     On 3/7/2024 5:52 PM, Warner Losh wrote:
>     >
>     >
>     > On Thu, Mar 7, 2024 at 4:24 PM Warner Losh <imp@bsdimp.com
>     > <mailto:imp@bsdimp.com>> wrote:
>     >
>     >
>     >
>     >     On Thu, Mar 7, 2024, 4:14 PM Tom Lyon <pugs78@gmail.com
>     >     <mailto:pugs78@gmail.com>> wrote:
>     >
>     >         For no good reason, I've been wondering about the early
>     history
>     >         of C compilers that were not derived from Ritchie,
>     Johnson, and
>     >         Snyder at Bell.  Especially for x86.  Anyone have tales?
>     >         Were any of those compilers ever used to port UNIX?
>     >
>     >
>     >     MIT had several that were used for ka9q and at least the
>     Venix x86
>     >     port. They supported the popular micros of the time. Various
>     >     versions of them survive to the present day.
>     >
>     >
>     > It's at bitsavers:
>     >
>     > https://bitsavers.org/bits/MIT/pc-ip/8086_C_19850820.tar
>     > <https://bitsavers.org/bits/MIT/pc-ip/8086_C_19850820.tar>
>     > and
>     > https://bitsavers.org/bits/MIT/trix/MIT_Compiler_Tape/
>     > <https://bitsavers.org/bits/MIT/trix/MIT_Compiler_Tape/>
>     >
>     > are pointers to compilers from the early 80s. Obviously not ANSI-C
>     > compilers :)
>     >
>     > Warner
>
>     See, also,
>     https://www.program-transformation.org/Transform/CCompilerHistory.html
>     &
>     http://www.desmet-c.com/.
>
>     When I only had PC/IX on an XT at my office and a PCjr at home, I
>     mostly
>     worked with C at home with DeSmet. I still have a couple of 5.25"
>     360K
>     diskettes labeled C-Ware, which I think are DeSmet 2.4.
>
>     Charlie
>
>     -- 
>     voice: +1.512.784.7526       e-mail: sauer@technologists.com
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>
>
>
> -- 
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