An archetypal dumb embedded-systems applicATion, like toaster (which superseded it).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.