Get software version and mouse type

        Entry:
          AX = 0024h

        Return:
          AX = FFFFh on error

          otherwise,
          BH = major version
          BL = minor version
          CH = type (1=bus, 2=serial, 3=InPort, 4=PS/2, 5=HP)
          CL = interrupt (0=PS/2, 2=IRQ2, 3=IRQ3,...,7=IRQ7)