in the late 60s the fad was to rewrite bigger instruction sets in
terms of smaller ones (the metric was # of instructions).  somebody
had a 16 instruction set that someone else reimplemented in 8
instructions.  the apollo guidance computer had 12 instructions and
a few magic memory locations. it was finally determinted you could get by on
one instruction --- some variation on predecrement and branch
if negative.  "look ma, no instructions."  unfortunately, this machine
was somewhat difficult to program

- erik

i think you're referencing the One Instruction Set Computer (OISC).

http://en.wikipedia.org/wiki/OISC

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