Calculate the following division and remainder:
P = DELTA / A
R = remainder as a fraction of A, where 1.0 = 255
Another way of saying the above is this:
(P R) = 256 * DELTA / A
This uses the same shift-and-subtract algorithm as TIS2, but this time we
keep the remainder.
Returns:C flagThe C flag is cleared
.DV41STAQ; Store A in QLDADELTA; Fetch the speed from DELTA into A; Fall through into DVID4 to do:;; (P R) = 256 * A / Q; = 256 * DELTA / A