INT 33 - MS MOUSE - DISABLE MOUSE DRIVER
        AX = 001Fh
Return: AX = 001Fh unsuccessful
             FFFFh successful
        ES:BX = vector for INT 33h before mouse driver was first installed
Note:   restores vectors for Int 10h and Int 71h (8086) or Int 74h (286/386)
        if you restore Int 33h to ES:BX, driver will be completely disabled