I/o panel, Number port description, Touch touch signal output to external pc – VIEWSONIC ViewBoard IFP8662 86" 4K Interactive Display User Manual
Page 13: Usb 2.0 for viewboard firmware upgrade, Power switch turn on/off ac power supply, Ac in ac power input, Spdif spdif output, Vga external pc image input, Audio in external pc audio input, Audio out audio out to an external speaker

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