Sure it's helpful. For a 16 x 16 multiply, you treat the numbers as
if they were two-digit numbers in base 256. Aside from that it's
grade-school math.

    AB
  x CD
  ----
  EFGH

Yes, it's more complex than if there was a 16 x 16 multiply command, but
having the 8x8 potentially makes things faster than bitwise multiplication.

> The hardware multiply isn't very helpful if you want to do more than 8bit
> multiplications, as it requires that you write everything the standard way
> instead of utilising the multiply function of the chip.
>
> -Peter
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jay@sprucegrove.com     !    And still have time to get a soft-shoe in...
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