X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 33 - ms mouse

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INT 33 - MS MOUSE - RESET DRIVER AND READ STATUS
        AX = 0000h
Return: AX = status
            0000h hardware/driver not installed
            FFFFh hardware/driver installed
        BX = number of buttons
            FFFFh two buttons
            0000h other than two
            0003h Mouse Systems/Logitech mouse
Notes:  to use mouse on a Hercules-compatible monographics card in graphics
          mode, you must first set 0040h:0049h to 6 for page 0 or 5 for page 1,
          and then call this function.
        the Logitech mouse driver contains the signature string "LOGITECH"
SeeAlso: INT 74

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