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I've always found the 9900 concept interesting, although its core
assumption about memory speed doesn't really hold up today; much of the
architecture was eventually reincarnated in TI's MSP430 series micro-
controllers, but they ditched the memory-resident register file. But for
the time, context-switching certainly didn't get any faster than that;
only three actual registers to save, but you still got a comfortably
PDP-11ish environment from the programmer's perspective.
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