X-Hacker.org- Interrupts & Ports

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        Return position and button status

        Entry:
          AX = 0003h

        Return:
          BX = button status
               bit 0  left button pressed if 1
               bit 1  right button pressed if 1
               bit 2  middle button pressed if 1 (Mouse Systems mouse)
          CX = column
          DX = row

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