An archetypal dumb embedded-systems application, like toaster (which superseded it). During one period (1983--84) in the deliberations of ANSI X3J11 (the C standardisation COMmittee) this was the canonical example of a really stupid, memory-limited COMputation environment. "You can' t require "printf(3)" to be part of the default run-time library - what if you' re targeting an elevator controller?" Elevator controllers became important rhetorical weapons on both sides of several holy wars.