Expects: AX    001aH
BX    horizontal speed, in mickeys-per-pixel
CX    vertical speed, in mickeys-per-pixel
DX    speed-doubling threshold, in mickeys-per-second
                                                                  
Returns: none
                                                                  
Info: This combines the functionality of INT 33H 000fH (set speed) and
INT 33H 0013H (set doubling threshold).

Use INT 33H 001bH to obtain the current values of these
variables.

- -

INT 33H 001aH: Set Mouse Sensitivity