PL/S

Programming Language/Systems

IBM late 60's, for the IBM 360 and 370

A machine-oriented language derived from PL/I, permitting inline assembly code and control over register usage. Much of IBM's 360 OS/MFT/MVT/SVS/MVS operating system was written in this language. It was used internally, and never released to the public. It is documented by various IBM internal ZZ-? publications.

"PL/S, Programming Language/Systems", W. R. Brittenham, Proceedings of GUIDE International, GUIDE 34, May 14, 1972, pp.540-556.

PLS1

PLSII