div by 10 on Z80

[Brent Hilpert]

Chuck Guzis wrote:
> 
> By now, we've probably bored the hardware guys to tears and DEC
> people are tearing out their hair, so we should probably drop the
> subject.
> 
> My apologies, but I've always found bit-twiddling fun.  It seems that
> every platform has some peculiar characteristic that can be exploited
> to good advantage.

I'm still following this and watching the improvements. (I'm still
looking at what docs I have here to ascertain exactly which way the Z80 vs 6800
borrow works, but some of it's ambiguous (just for my own sake, I still do some
assembler for both of them on occasion)).

Of course, from a clarity-is-all-important modern software design perspective,
we should all be shot.

If I were an economist, I would predict that at this rate, in another few weeks
the routine will be down to 1 byte.