<language> (Hal/Shuttle) A real-time high-level language for flight control applications. Hal was developed for NASA by Intermetrics, Inc. in the 1970s for on-board software. The initial version was a Fortran preprocessor, written in Fortran. In 1972, as the space shuttle project advanced, the language was renamed Hal/S and made more adaptable to architecture of different computers by using XPL. In all, 11 different implementations, mostly based on IBM 360, were created. Applications also included projects by JPL (Galileo probe, Deep Space network).

["Two-Dimensional Characteristics of HAL, A Language for Spaceflight Applications", J.S. Miller, SIGPLAN Notices 7(10), Oct 1972].

["Space Station Flight Software: Hal/S or Ada?", Allan R. Klumpp, "Computer", March 1985].