Int 33 Fn 000B  - MS Mouse V1.0+ - Read Motion Counters                    [M]

   AX = 000Bh

Return: CX = number of mickeys mouse moved horizontally since last call
   DX = number of mickeys mouse moved vertically

Notes: a mickey is the smallest increment the mouse can sense
   positive values indicate down/right

See Also: AX=0003h,AX=001Bh,AX=0027h