[TUHS] Re: On the uniqueness of DMR's C compiler

[Clem Cole <clemc@ccc.com>]

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s/Beety/Beatty/  -- sorry
ᐧ

On Wed, May 8, 2024 at 2:12 PM Clem Cole <clemc@ccc.com> wrote:

>
>
> On Wed, May 8, 2024 at 1:46 PM Al Kossow <aek@bitsavers.org> wrote:
>
>> Thoth has been a white whale for me for decades.
>
> Ditto.  Although, I believe the late John Beety had his 'Thoth Thucks" tee
> shirt for years.  I believe Kelly Booth still does.
>
>
>
>> AFAIK nothing has survived from it.
>>
> You can argue that V-Kernel and QNX are children of Thoth - but they were
> both in a flavor of Waterloo C that did not think ever targeted the PDP-11
> [that might be a misunderstanding WRT Waterloo C].
>
>>
>> "Decus" (Conroy's) C (transliteration of the assembler Unix C) should
>> also be mentioned.
>>
> Hmmmm, it's a flavor of Dennis' compiler in disguise and was sort of an
> end-around for the AT&T lawyers by taking the *.s files, and converting
> them to MACRO11, and then
> redoing the assembler code to use originally RT11 I/O and later RSX11.
> That said, it had its own life and ran on the DEC OSses, not UNIX, so it
> probably counts.
> That said, I thought Paul was asking about different core compiler
> implementations, and I would argue the DECUS/Conroy compiler is the DMR
> compiler, while the list I offered was all different core implementations.
>
> I'm curious about Jon and Tom's MOD2 compiler.   Other than Wirth's, which
> targeted the 68000, Lilith, and VAX, I did not know of another for the
> PDP-11.  Any idea of its origin story? I would have expected it to have
> derived from Wirth's Modula subsystem.  FWIW:  The DEC Mod-II and Mod-III
> were new implementations from DEC WRL or SRC (I forget).  They targeted
> Alpha and I, maybe Vax.  I'd have to ask someone like Larry Stewart or Jeff
> Mogul who might know/remember, but I thought that the font end to the DEC
> MOD2 compiler might have been partly based on Wirths but rewritten and by
> the time of the MOD3 FE was a new one originally written using the previous
> MOD2 compiler -- but I don't remember that detail.
>

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