detect overflow of multiply/ div32 result

[richard]

It's not complicated...
C=A*/B is same as C=(A*B)/$FF
C=A**B same as C=(A*B)/$FFFF

true but if you go on to a div32 then the result needs to be <$8000000
and that the div32 divider needs to be < $8000

and my meat calculator can't do /256 very easily

here is a start for a pbp calculator