The vga port is used for connecting a computer to a monitor. It was introduced in 1987 by IBM and was the replacement of MDA, CGA and EGA standards. To understand the need for the VGA video card you need to know what the previous standards could offer:
– The MDA standard or Monochrome Display Adapter supported only monochromatic text and a resolution of 720/350 pixels and it was manly used for non-graphic applications;
– CGA standard or Color Graphics Adapter who can support color text with a resolution of 320/200 pixels;
– EGA standard or Enhanced Graphics Adapter who support 640/350 graphics modes of 16 colors.
With the development of new and powerful processing units came the need of a new video standard and this is how the vga port was born. This new standard broth with it vga monitors compatible with 640×480 resolution and 4:3 aspect ratio.
The VGA connector has 15 pins displayed on three rows and for connecting a monitor to a computer you need a vga cable.
VGA port pinout description:
Pin 1 – Red
Pin2 – Green
Pin3 – Blue
Pin4 – No Connect
Pin5 – Ground
Pin6 – Ground
Pin7 – Ground
Pin8 – Ground
Pin9 – No Connect
Pin10 – Ground
Pin11 – No Connect
Pin12 – DDC DAT
Pin13 – Horizontal Synchronization
Pin14 – Vertical Synchronization
Pin15 – DDC Clock
With all its advantages the vga port remains an analogic hardware and with invention of LCD, Plasma and Led monitors came the need for an digital video port so starting from 2000 new technologies where implemented; technologies like DVI port or the latest HDMI port.
Most computers still have the vga port alongside with the dvi port, but if your pc is missing one then you can use a vga adapter. You can even fined vga to rca adapter used for connecting the vga port to tv.
One type of computers that had replaced the vga port with only DVI is the Apple computers. On this the mini VGA port has been replace with mini DVI port, and starting from 2008 the mini dvi port had been replaced with Mini Display Port who can support a resolutiom of 25600×1600 pixels.