OM writes:

Only Intel never released the MMX for the P6!

OM

Not as a co-pro, but I'm *pretty* sure MMX hardware went into the chip, let me
check...

Yessir, an a new set of instructions which evolved over time and are now known
as SSE4.2 in the Intel Core Microarchitecture*.

I worked extensively with the i860 which was the first Intel chip to include
MMX style hardware directly in the processor.

Dave

http://en.wikipedia.org/wiki/MMX_(instruction_set)