VGA stands for Video Graphics Array. The VGA standard was first developed by IBM. It uses analog signals, provides a 640 x 480 resolution screen with 16 colors at a time and a refresh rate of 60 Hz. Displays a outside of 256 colors at formerly from a collection of,144 colors. It consists of a 6- bit digital- to- analog motor for converting analog red, green, and blue( RGB) signals.
History
VGA was introduced by IBM in 1987 for its PS/ 2 line of PCs. The original VGA chipset( plates card) was the first to offer the capability to display up to 16 colors at a screen resolution of 640 × 480 pixels. Indeed at a lower resolution of 320 x 200 pixels, VGA could display up to 256 colors, making it easier to render small letters.
Other manufacturers soon produced plates cards displaying thousands to millions of colors, but they were all supersets of VGA, an extension of VGA, i.e. the base of all these plates cards is the same because VGA is supported by all computers. For this reason, it was used during the original zilches lading mode. For illustration, Microsoft Corporation’s Windows operating system uploaded its iconic splash screen in
VGA color.
VGA features
Resolution VGA provides a resolution of 640 x 480 pixels with 16 colors at formerly.
Affair Capability VGA supports All Points Nontransferable plates modes and alphanumeric textbook modes.
Color VGA displays a outside of 256 colors at formerly from a collection of,144 colors.
Refresh rate VGA has a refresh rate of 60 Hz.
Memory VGA has a memory operation of 256KB and has no fresh memory.
advantages
- It’s supported by all PCs from all manufacturers.
- VGA has only one standard and noversions. However, it’ll connect rightly to the VGA input, If the device has a VGA affair.
- VGA signals are analog signals, which means they will be more accurate than digital signals
- VGA made it easier to render small letters and increased legibility
- VGA was an enhancement over earlier forerunners similar as the Enhanced plates appendage, which produced a maximum resolution of 320 × 200 pixels.
- VGA signals can be fluently resolve using simple distribution amplifiers. This makes VGA so simple.
- VGA lines can be used as a” universal” analog string able of carrying RGBHV, YPbPr, compound and s- videotape signals.
Disadvantages
- This is an aged technology with a limited quantum of supported resolution.
- The color capacity of VGA is lower than that of its successors.
- VGA lines must have a larger sampling for longer operation.
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