79h UT$UMUL unsigned integer multipication
Input D register - unsigned integer.
X register - unsigned integer.
Output D register - More significant word of product.
X register - Less significant word of product.
UTW_S1 - More significant word of product (copy of D)
UTW_S2 - Less significant word of product (copy of X).
Description

2-byte by 2-byte unsigned integer multiply routine.

Multiplies D by X putting the product back into D and X, (and also into UTW_S1 and UTW_S2). The more significant word of the product goes into D (and into UTW_S1).

Example
example
Errors - none -