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Time critical stuff is always programmed in Assembly language. Other stuff might be, too, if you have talented "Hand Assemblers" in your code grouip. As compilers mature over time, less and less code is hand assembled. That rule applies to everything, not only consoles. Of course, writing in Assembler takes more time and is more error prone than simply using a high-level language, hence one tries to stay away from it as much as possible.