![]() In 1990 the original computers were replaced with an upgraded model AP-101S, which has about 2.5 times the memory capacity (about 1 megabyte) and three times the processor speed (about 1.2 million instructions per second). They have no hard disk drive and load software from magnetic tape cartridges. The CPU could process about 400,000 instructions per second. ![]() ![]() The IBM AP-101 computers originally had about 424 kilobytes of magnetic core memory each. Collectively they are called the Data Processing System (DPS). A fifth backup computer runs separate software called the Backup Flight System (BFS). Four computers run specialized software called the Primary Avionics Software System (PASS). "The Shuttle uses five identical redundant IBM 32-bit general purpose computers (GPCs), model AP-101, constituting a type of embedded system. Click to expand.space shuttles work on very old and very basic technology.
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