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INT 15 - SYSTEM - READ JOYSTICK (AT,XT2,XT286,PS)
        AH = 84h
        DX = subservice
            0000h get switch settings
                Return: AL = switch settings
                            bit 7: stick B button 2
                            bit 6: stick B button 1
                            bit 5: stick A button 2
                            bit 4: stick A button 1
            0001h read joystick inputs
                Return: AX = A(x) value
                        BX = A(y) value
                        CX = B(x) value
                        DX = B(y) value