[Simh] DECUS C

Shoppa, Tim tshoppa at wmata.com
Mon Aug 2 08:55:33 EDT 2010


> I'm trying to find a tape or disk or, in a pinch, even a files collection of the DECUS C\
> compiler for PDP-11.  I don't care if the OS is RT-11, RSX-11 or RSTS/E -- I've got all
> three available.

DECUS Special package 11SP68 is the “classic” DECUS distribution. Available from any of the major PDP-11 DECUS library archives (look it up in google.) e.g.

  http://www.classiccmp.org/PDP-11/RT-11/freeware/dsk/misc/

in “decusc.dsk”.

Alan Baldwin supplies some fixes to the original DECUS package that I highly recommend (especially if you want to build his TCP/IP with it). Available as disk images at e.g.

  http://pgb-arb.homeip.net/rthtml/tcpget.php

> Also, what C compilers were available on the VAX/780 running VMS?  Were any of
> them free/open software?

The two generations of C compilers DEC sells/sold for VAX/VMS are called “VAX C” and “DEC C”.

As to modern free compilers (e.g. ANSI C and not K&R C) GCC works fine if exquisitely slowly at 1 VUP. See any of the VMS DECUS collections.

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