SYMPL
SYMPL is an obsolete programming language developed by the Control Data Corporation (CDC) for use on the CDC 6000 series computer systems in the 1970s and 1980s.  It was based on a subset of CDCs version of JOVIAL, as an alternative to assembly language.  A number of important CDC software products were implemented in SYMPL, including compilers, libraries, a full-screen editor, and major subsystems.

SYMPL is a compiled, imperative, and procedural language.  Compared to the Fortran of the day, SYMPL supports:

 Stronger data typing - All variables must be declared prior to use,
 Data structures - Including "based" dynamically allocated structures,
 Structured programming constructs,
 Nested procedures,
 In-fix "bead" (bit) and character manipulation
 A simple macro facility

Simplifications compared to JOVIAL include: fewer built-in data types, no recursive calls to procedures, and no COMPOOL concept.

External links
 Ninety-nine Bottles of Beer program - written in SYMPL
 SYMPL coding standard
 SYMPL Reference Manual
 SYMPL Users Guide

Procedural programming languages
Systems programming languages
Control Data mainframe software
Programming languages created in the 1970s