VGA Full Form in Computer | Full Form of VGA in Computer
VGA Full Form - Video Graphics Array
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Video Graphics Array
- VGA stands for Video Graphics Array. It’s a display hardware developed by IBM in 1987. It has the first introduced with IBM PS/2 line of computers.
- It provides a resolution of 640x480 pixels and a refresh rate of 60 Hz.
- VGA is referred as an array instead of an adopter because it has the implemented from the beginning as a single chip (ASIC). It uses analog signals instead of digital signals.
- The original VGA has the following specification:
- 256 kB Video RAM.
- 16-color and 256-color paletted display modes.
- 262,144-color global palette (6 bits, and therefore 64 possible levels, for every one of the red, green, and blue channels via the RAMDAC).
- Selectable 25.175 MHz or 28.322 MHz master pixel clock.
- Usual line rate fixed at 31.469 kHz.
- Maximum of 800 horizontal pixels.
- Maximum of 600 lines.
- Refresh rates at up to 70 Hz.
- Vertical blank interrupt.
- Planar mode: up to 16 colors (4-bit planes).
- Packed-pixel mode: 256 colors (Mode 13h).
- Hardware smooth scrolling support.
- No hardware sprites.
- No Blitter, but supports very fast data transfers via "VGA latch" registers.
- Barrel shifter.
- Split screen support.
- 0.7 V peak-to-peak.
- 75 ohm double-terminated impedance (18.7 mA, 13 mW).
Shape and Size
- A VGA connector is formed like a trapezoid and its 15 pins. If you have an old monitor designed for the older standards may not be able to work with Video Graphics Array standards.
- The older VGAs provide a resolution of 640x480 pixels. After that version, many revisions are introduced.
- The most common version of VGA is Super VGA (SVGA). It allows for resolutions greater than 640x480, like 800x600 or 1024x768.