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WHAT IS VIDEO GRAPHICS ARRAY?

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Ishaan Chaudhary
WHAT IS VIDEO GRAPHICS ARRAY?

Video Graphics Array is an abbreviation for this. IBM released this piece of display hardware in 1987. It was originally available on IBM PS/2 personal computers. In terms of picture quality, it has a 640 × 480 pixel resolution and a 60 hertz refresh rate.


When referring to VGA displays, the term "array" is used instead of "adopter" since the technology was originally designed to work with a single chip (ASIC). As opposed to digital signals and mechanics, analog ones are used.

 

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TECHNICAL SPECIFICATIONS


The following are the technical requirements of the original VGA:


  1. Memory for Graphics of 256 Kilobytes
  2. Palette sizes of 16 colors and 256 colors are supported.
  3. The world's 262,144-color palette (6 bits, and therefore 64 possible levels, for each of the red, green, and blue channels via the RAMDAC)
  4. Selectable master pixel clock of 25.175 MHz or 28.322 MHz
  5. The standard line frequency has been set at 31.469 kHz.
  6. Limit of 800 pixels across the width
  7. Limited to no more than 600 characters
  8. Up to 70 hertz of refresh rate
  9. Spacer in the vertical blank
  10. In planar mode, you may use up to 16 colors (4-bit planes)
  11. Condensed color mode (256 shades) (Mode 13h)
  12. Support for fluid scrolling in hardware
  13. Lack of graphical representations of hardware,
  14. There is no Blitter, but the "VGA latch" registers allow for very quick data transfers.
  15. Converting barrel
  16. Ability to split the screen
  17. Seven hundred and thirty millivolts (V) peak-to-peak
  18. There is a 75 ohm impedance between two 75 ohm terminals (18.7 mA, 13 mW)

 

 

SHAPE AND SIZE

A VGA connection is shaped like a trapezoid and it contains 15 pins. An older monitor built for earlier standards might not be compatible with the newer Video Graphics Array specifications.

 

 

COMPATIBILITY

The earlier VGAs have a resolution of 640x480 pixels. Numerous updates have been released since then. Super VGA is by far the most widely used variant of VGA (SVGA). Supports higher-than-640-by-480 resolutions like 800x600 and 1024x768.

 

 

WHAT VGA IS USED FOR

IBM's Video Graphics Array was a widely used media transmission technology in the late 1990s. Recently, because of the growing interest in classic video games by players, it has even seen a revival. The VGA's color display supports 16 colors at its default 640*480 resolution, and up to 256 colors by decreasing the resolution to 320*200.


In a wide variety of contexts, the VGA standard has proven useful. Here are a few examples:


  1. A computer and a display may be connected through VGA.
  2. The Video Graphics Array (VGA) standard is used by laptops to output video to an external display device such as a TV or projector.
  3. VGA technology may be used to show material on TV or a projector, and it is supported by even relatively new inventions like smart TVs and Chromecast.

 

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COMPONENTS OF VGA


An optional VGA cable connects the VGA's connections. The connections link the information's final resting place with its point of origin. The VGA cable's source device must be connected to one of the VGA connector's 15 pins. Because of the pins, analog signals may be sent. Male VGA connections contain pins, whereas female connectors use holes. In addition to the pins, the VGA connection has a pair of screws on each side of the connector head (holes in the case of female VGA). The cable is attached to the source device using these screws.


The DE-15, or standard 15-pin, VGA connection, is the most ubiquitous kind of VGA and is used for a wide variety of applications and interactions. Nonetheless, a VGA interface with fewer pins, the DE-9, is available for smaller form factor devices. The connection has only 9 pins, as its name indicates. The conventional VGA pinout consists of the following components:

 

Pin 1-Red Video

Pin 2-Green Video

Pin 3-Blue Video

Pin 4-Monitor ID 2

Pin 5-TTL Ground

Pin 6-Red Analog Ground

Pin 7-Green Analog Ground

Pin 8-Blue Analog Ground

Pin 9-Key

Pin 10-Sync Ground

Pin 11-Monitor ID 0

Pin 12- Monitor ID 1

Pin 13-Horizontal Sync

Pin 14-Vertical Sync

Pin 15-Monitor ID 3

 

The maximum distance that VGA signals may be transmitted is 20 metres. Once the signal distance exceeds this threshold, specialized components called VGA extenders may be utilized to further expand the signal.

 

 

RESOLUTIONS

Due to the nature of analog transmissions, the VGA standard's resolutions were necessarily low and simplistic. VGA was widely used since it was generally sufficient for the intended applications until the introduction of newer high-end resolutions like HD. Technology progressed to the point that VGA no longer sufficed for its original use.

The VGA's 640x540 resolution was the most widely used at first. Besides 800x600 and 1024x768, the VGA supported resolutions of 1024x768 and Extended Graphics Array (EGA).

 

Other resolutions include:

1280*1024(super extended graphics array) (super extended graphics array)

1600*1200(ultra extended graphics array) (ultra extended graphics array)

2040*1536(wide extended graphics array) (wide extended graphics array)

 

 

ALTERNATIVES TO THE VGA

It has been a long time since the introduction of VGA. With the development of new technologies comes an increase in the technical proficiency of technicians. The introduction of cutting-edge technologies in recent years has given audiences the impression that they have stepped into a computer-generated environment. Since the introduction of VGA, various competing technologies have emerged. The following are only a few examples:

 

HDMI:

A choice you might have made using the TV and the latest iteration of VGA. When it comes to transferring high-definition music and video, the experts at High Definition Multimedia Interface (HDMI) are unrivaled. The usage of HDMI as an interface system is becoming more commonplace in consumer electronics, with even personal computers and laptops adopting the standard as a means of transferring high-quality audio and video signals.

 

DVI:

The original purpose of the Digital Visual Interface (DVI) was to facilitate the transfer of high-quality sound and video across electronic gadgets. Up to 2560 x 1600 pixels are supported. Screens for computers and TVs have adapted the technology.

 

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