70's computers

[Noel Chiappa]

    > From: Paul Koning

    > A lot more comes from the CPU architecture. The instruction set, of
    > course (arguably the first RISC).

An observation about RISC: I've opined before that the CISC->RISC transition
was driven, in part, by the changing balance of CPU speed versus memory
speed: with slow memory and fast CPUs, it makes sense to get as much
execution bang out of every fetch buck (so complex instructions); but when
memory bandwidth goes up, one needs a fast CPU to use it all (so simple
instructions).

It occurs to be that the same balance probably applies to memory _size_. When
memories are small, one wants dense code (which probably means CISC); only
with larger memories does RISC, with its less-dense code, make sense.

	Noel