Re: PL/S ??
- From: tzha1@xxxxxxxxxxxxx (Tony Harminc)
- Date: 31 Oct 2007 14:12:25 -0700
On Wed, 31 Oct 2007 09:17:53 -0500, Mark H. Young
<Mark.Young@xxxxxxxxxxxxxxxxx> wrote:
Does a copy of PL/S from IBM exist anywhere in the public domain?
Not a chance. There was a version made available to ISVs for a brief period
in the 1990s, but not before or after. (Well, not under any generally
available scheme; it wouldn't surprise me to find that some non-IBM
companies have it under some sort of private agreements, but I don't
actually know of any.)
Or would there be somewhere on a z/OS mainframe system I could find a
sample of the code?
Do you mean a sample of code written in the PL/S language? There's no
shortage of such samples, in various dialects of PL/S, PL/X etc. but you
won't have any way of compiling them unless you want to try writing your own
compiler.
Old PL/S code can be found as comments in the MVS 3.8 assembler source
available in a number pf places on the net, including CBTTAPE.ORG . A handy
place to browse MVS 3.8 source is http://www.mainframe.eu/mvs38/asm/
An example of this PL/S-generated assembler is
http://www.mainframe.eu/mvs38/asm/TSO%20(IKJ)/IKJCT431
or just about any of the IKJ modules found nearby. If you just edit the
assembler program to remove all but the comments (* in column one), you'll
have a very good approximation to the original PL/S source. Watch the
ASCIIfication of some symbols though; the EBCDIC not sign has probably been
turned into an ASCII caret.
A newer example of PL/X 370 source can be found on IBM's VM downloads site
at http://www.vm.ibm.com/download/packages/timeserv.vmarc
You will need a fairly modern VM system to unpack this, but it has both PL/X
source and the generated assembler code.
This is what I found on Wikipedia:usage.
PL/S, short for Programming Language/Systems, is a "machine-oriented"
programming language based on PL/I. It was developed by IBM in the late
1960s as a replacement for assembly language on internal software projects;
it included support for inline assembly and explicit control over register
Early projects using PL/S were the batch utility, IEHMOVE, and the Time
Sharing Option of MVT, TSO.
Most of TSO was/is indeed written in PL/S (or BSL, as the earliest versions
were called), but I'm almost certain IEHMOVE was not. But have a look; it's
easy to recognize.
Tony H.
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