IBM's Federal Systems Division is responsible for supplying 'error-free' software for NASA's Space Shuttle Program. The Shuttle's Primary Avionics Software System (PASS) is the highly fault-tolerant, on-board software that controls most aspects of Shuttle operation. The on-board system (called the DPS, for data processing system) utilizes five computers, which are known as GPCs (general-purpose computers). The PASS resides in a maximum of four of these at any one time. Since the software needed to support an entire mission would be too large to occupy the primary memory, it has been divided into eight overlays that make up the operational programs of PASS. The software has an operating system written in assembler and applications written in HAL/S, a high-order language developed by Intermetrics Inc. of Cambridge, Massachusetts.
The Space Shuttle primary computer system
Die Primaerrechnersysteme der Space Shuttle
Communications of the ACM ; 27 , 9 ; 872-900
1984
29 Seiten, 5 Quellen
Article (Journal)
English
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