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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, 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. Early projects using PL/S were the batch utility, IEHMOVE, and the Time Sharing Option of MVT, TSO. Closed PL/S meant that only IBM could easily modify and enhance the operating system.

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  • PL/S (de)
  • IBM PL/S (en)
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  • PL/S ist eine IBM Mainframe Programmiersprache abgeleitet von PL/I in den späten 1960er-Jahren unter anderem für IBM S/360, IBM S/370 und IBM S/390 Systemen. Anfänglich wurde sie für systemnahe Software, später auch für Anwendungssoftware verwendet. PL/S erlaubt Inline-Assemblersprache und damit direkte Kontrolle über die Hardware, wie Register, Programm Status Word etc. (de)
  • 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, 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. Early projects using PL/S were the batch utility, IEHMOVE, and the Time Sharing Option of MVT, TSO. Closed PL/S meant that only IBM could easily modify and enhance the operating system. (en)
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  • PL/S ist eine IBM Mainframe Programmiersprache abgeleitet von PL/I in den späten 1960er-Jahren unter anderem für IBM S/360, IBM S/370 und IBM S/390 Systemen. Anfänglich wurde sie für systemnahe Software, später auch für Anwendungssoftware verwendet. PL/S erlaubt Inline-Assemblersprache und damit direkte Kontrolle über die Hardware, wie Register, Programm Status Word etc. (de)
  • 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, 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. Early projects using PL/S were the batch utility, IEHMOVE, and the Time Sharing Option of MVT, TSO. By the 1970s, IBM was rewriting its flagship operating system in PL/S. Although users frequently asked IBM to release PL/S for their use, IBM refused saying that the product was proprietary. Their concern was that open PL/S would give competitors, Amdahl, Itel (National Advanced Systems), Storage Technology Corporation, Trilogy Systems, Magnuson Computer Systems, Fujitsu, Hitachi, and other PCM vendors a competitive advantage. However, even though they refused to make available a compiler, they shipped the PL/S source code to large parts of the OS to customers, many of whom thus became familiar with reading it. Closed PL/S meant that only IBM could easily modify and enhance the operating system. PL/S was succeeded by PL/S II, PL/S III and PL/AS (Programming Language/Advanced Systems), and then PL/X (Programming Language/Cross Systems). PL/DS (Programming Language/Distributed Systems) was a closely related language used to develop the DPPX operating system, and PL/DS II was a port of the S/370 architecture for the DPPX/370 port. As the market for computers and software shifted away from IBM mainframes and MVS, IBM recanted and has offered the current versions of PL/S to select customers (ISVs through the Developer Partner program.) (en)
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