INT 33H 000bH: Query Motion Distance

 Expects: AX    000bH
 Returns: CX    Horizontal motion since last call (>0=right; <0=left)
          DX    Vertical motion since last call (>0=down; <0=upward)
    Info: This obtains the distance the mouse has been moved since the most
          recent call to this function.  The returned values are in units
          called mickeys.  To convert to pixels, use INT 33H 001bH to query
          the current mickeys-to-pixel ratios).

          Note that CX and DX return as signed values, with negative
          numbers being a distance upward and to the left and positive
          values being motion downward and to the right.

See Also: INT 33H: Mouse Support
          Interrupts and BIOS Services