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What is VGA pass-though?

April 26, 2017VGA

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What is VGA pass-though?

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The Voodoo Graphics ™ (but not the Voodoo Rush ™) boards are add-on boards, meant to be used with a regular 2D VGA video accelerator board. In short, the video output of your regular VGA board is used as input for the Voodoo Graphics ™ based add-on board, which by default passes it through to the display also connected to the Voodoo Graphics ™ board. If the Voodoo Graphics ™ is used (e.g. by a game), it will disconnect the VGA input signal, switch the display to a 640×480 fullscreen mode with the refresh rate configured by SST variables and the application/driver, and generate the video signal itself. The VGA doesn’t need to be aware of this, and won’t be. This setup has several advantages: free choice of 2D VGA board, which is an issue with Linux, as XFree86 drivers aren’t available for all chipsets and revisions, and a cost effective migration path to accelerated 3D graphics.