![]() ![]() Although users frequently asked IBM to release PL/S for their use, IBM refused saying that the product was proprietary. ![]() ![]() It was developed by IBM in the late 1960s, under the name Basic Systems Language ( BSL), as a replacement for assembly language on internal software projects it included support for inline assembly and explicit control over register usage.Įarly projects using PL/S were the batch utility, IEHMOVE, and the Time Sharing Option of MVT, TSO.īy the 1970s, IBM was rewriting its flagship operating system in PL/S. PL/S, short for Programming Language/Systems, is a "machine-oriented" programming language based on PL/I.
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