BSL was the first version of IBM's internal HLL for systems programming.
BSL is to PL/S as PL/S is to PL/X.
AFAIK, OS/360 PCP, MFT and MVT were developed almost entirely in BAL. It
was not until well into the evolution of MVT that BSL was first used for
much of TSO and some other utilities.
You can find some BSL manuals at http://www.bitsavers.org/pdf/ibm/360/bsl/
> Shmuel Metz (Seymour J.) wrote:
Do you count BSL as being PL/S? It was heavily used in OS/360, for TSO.
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