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This article mainly introduces what cga, ega, vga refer to, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let the editor take you to understand it.

The performance index of "graphics card". CGA (Color Graphics Adapter) is the first computer display standard on IBM PC; VGA (Video Graphics Array) is a computer display standard that uses analog signals; and EGA (enhanced Graphics Adapter) is the IBM PC computer display standard definition, with performance between CGA and VGA.

Cga, ega and vga are the performance indicators of the "graphics card".

CGA: color graphics adapter, providing two standard text display modes: 40 × 25 × 16 color and 80 × 25 × 16 color, and two commonly used graphic display modes: 320x200x4 color and 640x200x2 color

EGA: enhanced graphics adapter, between CGA and VGA in terms of display performance (color and resolution). EGA cards provide two modes: text and color graphics.

VGA: video graphics array, which has the advantages of high resolution, fast display speed and rich colors, has been widely used in the field of color displays. VGA first refers to the display mode of 640x480s.

Detailed introduction

CGA (color graphics adapter)

Color graphics adapter (CGA, Color Graphics Adapter) is the first color graphics card listed by IBM in 1981, and it is also the first computer display standard on IBMPC. The standard IBM CGA graphics card has 16 kilobytes of display memory. CGA cards provide a variety of graphic and text display modes, as well as a display resolution of up to 640 × 200 and a display ability of up to 16 colors (usually not at the maximum resolution). The usual display ability of CGA is to display up to four colors at a resolution of 320 × 200, but there are many other ways to simulate more colors.

CGA provides two standard text display modes: 40 × 25 × 16 color and 80 × 25 × 16 color, and two commonly used graphic display modes: 320 × 200 × 4 color and 640 × 200 × 2 color.

With the development of computer technology, CGA has also been replaced by the enhanced graphics adapter (EGA, Enhanced Graphics Adapter) introduced by IBM in 1984.

VGA (video graphics array)

Video graphics array (English: Video Graphics Array, referred to as VGA) is a computer display standard using analog signals proposed by IBM in 1987. This standard has become very outdated for today's PC market. Even so, VGA is still a standard supported by most manufacturers, and personal computers must support the VGA standard before loading their own unique drivers. For example, the boot screen of Microsoft Windows series products still uses VGA display mode, which also shows the lack of resolution and color load.

The term VGA is often used directly to refer to a resolution of 640 × 480, regardless of its graphics device. VGA devices can store four complete EGA color plates at the same time, and they can be quickly converted between them, which looks like instant discoloration on the screen.

EGA (enhanced graphics adapter)

The enhanced graphics adapter (Enhanced Graphics Adapter or EGA) is a standard definition of IBM PC computer display, somewhere between CGA and VGA in terms of display performance (color and resolution).

It is the technology introduced by IBM for its new PC-AT computer in 1984. EGA can reach 16 colors at a resolution as high as 640x350. EGA includes a 16KB read-only memory (ROM) to extend the system BIOS for additional display functions, and includes an Motorola MC6845 video address generator.

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