The Curious Case of 'Special Register Groups'
2025-08-27
A seemingly innocuous definition of a CPU – 'containing main storage, arithmetic unit, and special register groups' – has persisted for half a century. This originates from the 1959 Honeywell 800 mainframe, which allowed multiple programs to share a processor, each with its own set of 32 registers. Despite the Honeywell 800's obsolescence, 'special register groups' stubbornly survived in countless glossaries, even appearing in the Washington Post and the National Fire Code. This demonstrates how definitions in authoritative glossaries endure for decades, even when obsolete terms refuse to die.
Tech
CPU definition