> Alright, you win.  How could it depend on the machine,
 > though.

    You have to go back through the mists of time, Neil. Fundamentally the
number of single word or byte instructions available to any MPU is a
function of the width of the data word. The narrower, the fewer. When there
are less than 64 in all, choices have to be made by the manufacturer about
which machine instructions to drop. SCMP was a prime example. How was this
relevant? By 1975 there was an adequate C to ForTran converter, and a
ForTran Compiler for the SCMP. Of course, this was before ANSI C.

Best Wishes,
Bill.

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