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Tuesday, January 26, 2010

What is VGA?

VGA or Video Graphic Array


          Refers specifically to the display hardware first introduced with the IBM PS/2 line of computers in 1987,but through its widespread adoption has also come to mean either an analog computer display standard, the 15-pin D-subminiature VGA connector or the 640×480 resolution itself. While this resolution has been superseded in the personal computer market, it is becoming a popular resolution on mobile devices.

          Video Graphics Array (VGA) was the last graphical standard introduced by IBM that the majority of PC clonelowest common denominator that all PC graphics hardware supports, before a device-specific driver is loaded into the computer. For example, the MS-Windows splash screen appears while the machine is still operating in VGA mode, which is the reason that this screen always appears in reduced resolution and color depth. manufacturers conformed to, making it today (as of 2009) the
VGA was officially superseded by IBM's XGA standard, but in reality it was superseded by numerous slightly different extensions to VGA made by clone manufacturers that came to be known collectively as "Super VGA".


Pin Configuration


Pin out
DE15 Connector Pinout.svg
A female DE15 socket (videocard side).
Pin 1 RED Red video
Pin 2 GREEN Green video
Pin 3 BLUE Blue video
Pin 4 ID2/RES formerly Monitor ID bit 2, reserved since E-DDC
Pin 5 GND Ground (HSync)
Pin 6 RED_RTN Red return
Pin 7 GREEN_RTN Green return
Pin 8 BLUE_RTN Blue return
Pin 9 KEY/PWR formerly key, now +5V DC
Pin10 GND Ground (VSync, DDC)
Pin 11 ID0/RES formerly Monitor ID bit 0, reserved since E-DDC
Pin 12 ID1/SDA formerly Monitor ID bit 1, I²C data since DDC2
Pin 13 HSync Horizontal sync
Pin 14 VSync Vertical sync
Pin 15 ID3/SCL formerly Monitor ID bit 3, I²C clock since DDC2
The image and table detail the 15-pin VESA DDC2/E-DDC connector; the diagram’s pin numbering is that of a female connector functioning as the graphics adapter input. In the male connector, this pin numbering corresponds with the mirror image of the cable’s wire-and-solder side.
 

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