PL/M

PL/M, aka Programming Language for Microcomputers, is a programming language created in 1973.

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51Years Old

The PL/M programming language (an acronym of Programming Language for Microcomputers) is a high-level language conceived and developed by Gary Kildall in 1973 for Hank Smith at Intel for its microprocessors. The language incorporated ideas from PL/I, ALGOL and XPL, and had an integrated macro processor. Unlike other contemporary languages such as Pascal, C or BASIC, PL/M had no standard input or output routines. Read more on Wikipedia...

PL/M Wikipedia page
PL/M first developed in Microcomputer Applications Associates
PL/M on HOPL
See also: (4 related languages)Algol, PL/I, XPL, C

Example from Wikipedia:

FIND: PROCEDURE(PA,PB) BYTE;
    DECLARE (PA,PB) BYTE;
    /* FIND THE STRING IN SCRATCH STARTING AT PA AND ENDING AT PB */
    DECLARE J ADDRESS,
        (K, MATCH) BYTE;
    J = BACK ;
    MATCH = FALSE;
        DO WHILE NOT MATCH AND (MAXM > J);
        LAST,J = J + 1; /* START SCAN AT J */
        K = PA ; /* ATTEMPT STRING MATCH AT K */
            DO WHILE SCRATCH(K) = MEMORY(LAST) AND
                NOT (MATCH := K = PB);
            /* MATCHED ONE MORE CHARACTER */
            K = K + 1; LAST = LAST + 1;
            END;
        END;
    IF MATCH THEN /* MOVE STORAGE */
        DO; LAST = LAST - 1; CALL MOVER;
        END;
    RETURN MATCH;
    END FIND;

Feature	Supported	Token	Example
Assignment	✓	:=
Comments	✓		/* A comment */
MultiLine Comments	✓	/* */	/* A comment */
Semantic Indentation	X

PL/M - Programming language

Language features