Rain would play HAL in the sequel 2010: The Year We Make Contact and another HAL-ish computer in Woody Allen’s Sleeper.
And a huge part of HAL was his voice, provided by Canadian actor Douglas Rain.
A veteran stage actor in Canada, Rain supposedly performed the voice of HAL “with his bare feet resting on a pillow, in order to maintain the required relaxed tone.”
The list of the greatest computers in the history of movies is pretty much HAL 9000 — the troubled, deadly artificial intelligence in 2001: A Space Odyssey — and then everybody else.