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What is the full form of VGA?

Full form of VGA: Here, we are going to learn what does VGA stands for? VGA – which is an abbreviation of "Video Graphics Array" in Gadget Acronyms/Abbreviations, etc.
Submitted by Anushree Goswami, on March 18, 2020

VGA: Video Graphics Array

VGA is an abbreviation of "Video Graphics Array".

It is a three-row 15-pin DE-15 connector display hardware developed by IBM in 1987. It was first launched with the IBM PS/2 line of computers. It makes available a resolution of 640x480 pixels and a refresh rate of 60 Hz.

VGA has alluded as an array at the place of an adopter because it was put into operation from the beginning as a single chip (ASIC). It uses analog signals as opposed to digital signals.

Image source: https://www.indiamart.com/proddetail/projecter-vga-cable-20078614862.html

Technical Specifications of VGA

Following are the technical specifications provided in the original VGA, which are:

• 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 each 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)

VGA Shape and Size

• A VGA connector is shaped like a trapezoid and it has 15 pins.
• If a user has an old designed monitor according to the older standards, then it may not be able to operate with Video Graphics Array standards.

VGA Compatibility

• The older VGAs make available a resolution of 640x480 pixels.
• After that older version, many modifications have been launched.
• The highly general version of VGA is Super VGA (SVGA). It enables resolutions better than 640x480, such as 800x600 or 1024x768.

VGA Design

• VGA connectors and cables transmit analog component RGBHV which are red, green, blue, horizontal sync, vertical sync video signals, and VESA Display Data Channel (VESA DDC) data.
• The IBM 8513 monitor defined pin 5 as "Self Test", which put on view a white screen when the cable is disjointed.
• The IBM PS/55 Display Adapter defined pin 9 as "+12V". It switches on the exact monitor when the system component is powered on.