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the unit can restore all settings on power-up from non-volatile memory. A list of channels can be stored in memory, used to provide convenient channel up/down operation and restrict direct access to other channels. An optional onboard character generator provides on-screen text for channel names, interactive menus, and system feedback. Switchable inputs for NTSC video and stereo audio are included for display of PC graphics, a character generator information channel, camera or other A/V sources.