(PL/S) An
IBM machine-oriented language derived
from
PL/I in the late 1960s for the
IBM 360 and
IBM 370.
PL/S permitted
inline assembly language and control over
register usage.
Much of IBM 360
OS/MFT(?),
OS/MVT(?),
OS/VS1 and
OS/VS2 (OS/SVS and
MVS) were written in PL/S. It was
used internally and never released to the public. It is
documented in various IBM internal ZZ-? publications.
Versions: PLS1, PLSII.
["PL/S, Programming Language/Systems", W.R. Brittenham, Proc
GUIDE Intl, GUIDE 34, May 14, 1972, pp. 540-556].