Say you have two instructions: instr 1 uses 8 cycles, and have 2 cycles
tail. instr 2 uses 8 cycles and have 2 cycles head.

instr 1: --------
instr 2:       --------

As you can see the head and tail overlap eachother. So we save two cycles
here, instead of 16c we get 14c. It's also called pipelining, even if the
030 is very limited in these cases.

--Anders Eriksson
ae@dhs.nu