Inaccurate descriptions of this elegant high-level language called it "A FORTRAN/COBOL hybrid".  Its block structure is reminiscent of ALGOL or even LISP.  But sadly, PL/I never caught on the way it should have.

IBM positioned PL/I as a high-level replacement for BAL.  Its virtue was that it made the nature of the System/360 hardware visible at the level of the application program; PL/I programs run very fast.  This close linkage to the hardware was also its curse; most PL/I programs written for byte-addressable machines (like the Sys/360) couldn't port to other platforms.  Other PL/I's, running on machines with an addressability other than to the byte, were functional cripples.  So PL/I stayed an IBM-shop specialty item.

Interestingly, the Sperry Corporation so well understood the strength of a language like PL/I that they fostered two languages similar to it: PLUS (Programming Language for Univac Systems) and PLUM (Programming Language for Univac Microprocessors).  But PLUS was used only in portions of certain Sperry software products; and although PLUM was offered to end-users, few took advantage of it.

We are expert in PL/I.  Call us if this language is still part of your life.

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