Re: PL/S ??

-----Original Message-----
From: IBM Mainframe Discussion List [mailto:IBM-MAIN@xxxxxxxxxxx] On
Behalf Of McKown, John
Sent: Wednesday, October 31, 2007 2:32 PM
To: IBM-MAIN@xxxxxxxxxxx
Subject: Re: PL/S ??

-----Original Message-----
From: IBM Mainframe Discussion List
[mailto:IBM-MAIN@xxxxxxxxxxx] On Behalf Of Mark H. Young
Sent: Wednesday, October 31, 2007 9:18 AM
To: IBM-MAIN@xxxxxxxxxxx
Subject: PL/S ??
<SNIPage>
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 usage.
<SNIPage>
From what I understand, you are more likely to get Top Secret
information out of the CIA than get PL/S out of IBM. I don't even think
that there is the equivalent of a Language Reference manual around for
it that is not INTERNAL USE ONLY. It is one of IBM's super secret
languages. Most likely because IBM does not want to be "hobbled" by
backwards compatibility if some end user got ahold of it.
<SNIP>

If I remember correctly, PL/S has been replaced with PL/AS (and
somewhere in there was PL/X). And if memory serves me correctly, PL/AS
was being used in 1990 at STL. And it was so protected that if you were
a contractor, you could not see the input source, only the ASM listing
produced (for doing APARs).

Regards,
Steve Thompson

-- All opinions expressed by me are my own and may not necessarily
reflect those of my employer. --

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