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Abbreviation for Voluntary Control Council for Interference.

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Abbreviation for volt(s) direct current.

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Abbreviation for Verband Deutscher Elektrotechniker.

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Abbreviation for Virtual Direct Memory Access Services.

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Acronym for Video Electronics Standards Association.

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Abbreviation for video graphics array. VGA and SVGA are video standards for video adapters with greater resolution and color display capabilities than EGA and CGA, the previous standards.

To display a program at a specific resolu- tion, you must install the appropriate video drivers and your monitor must sup- port the resolution. Similarly, the number of colors that a program can display de- pends on the capabilities of the monitor, the video driver, and the amount of mem- ory installed for the video adapter.

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On some systems with a built-in VGA video adapter, a VGA feature connector allows you to add an enhancement adapt- er, such as a video accelerator, to your computer. A VGA feature connector can also be called a VGA pass-through

connector.

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The logical circuitry that provides—in combination with the monitor or display— your computer’s video capabilities. A video adapter may support more or fewer features than a specific monitor offers. Typically, a video adapter comes with video drivers for displaying popular

application programs and operating envi- ronments in a variety of video modes.

On most current Dell computers, a video adapter is integrated into the system board. Also available are many video adapter cards that plug into an expansion- card connector.

Video adapters can include memory sep- arate from RAM on the system board. The amount of video memory, along with the adapter’s video drivers, may affect the number of colors that can be simulta- neously displayed. Video adapters can also include their own coprocessor chip for faster graphics rendering.

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Graphics-mode application programs and operating environments, such as Win- dows, often require video drivers in order to display at a chosen resolution with the desired number of colors. A program may include some “generic” video drivers. Any additional video drivers may need to match the video adapter; you can find these drivers on a separate diskette with your computer or video adapter.

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Most VGA and SVGA video adapters in- clude VRAM or DRAM memory chips in addition to your computer’s RAM. The amount of video memory installed prima- rily influences the number of colors that a program can display (with the appropriate video drivers and monitor capability).

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Video adapters normally support multiple text and graphics display modes. Charac- ter-based software (such as MS-DOS) displays in text modes that can be defined as x columns byy rows of characters. Graph- ics-based software (such as Windows) displays in graphics modes that can be de- fined as x horizontal by y vertical pixels by z colors.

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Video resolution—640 x 480, for exam- ple—is expressed as the number of pixels across by the number of pixels up and down. To display a program at a specific

18 Dell PowerVault 720N, 740N, and 760N User’s Guide