The origin of civil graphics cards can be traced back to the 1980s. 198 1 year, when IBM introduced personal computers, it provided two kinds of graphics cards, one is quot monochrome graphics card (MDA for short) and the other is color drawing card (CGA for short). As can be seen from the name, MDA can display 80 lines of alphanumeric characters when used with monochrome display, while CGA can be used on RGB display screen to draw graphics and alphanumeric data. At that time, computers were mainly used for word data processing. Although the resolution of MDA is 752 points wide and 504 points high, it is not enough to meet the display requirements, but it is more than enough for text data processing. CGA, on the other hand, has the ability of color and graphics, which can meet the general requirements of displaying graphic data, but the resolution is only 640x350, which naturally cannot be compared with the current color display.

MGA/MCGA graphics card

1982, IBM introduced MGA(Monochrome Graphic Adapter), also known as Hercules Card, which can not only display graphics, but also retain the functions of the original MDA. In those days, many games needed this card to display animation effects. At that time, EGA (Enhanced Graphics Adapter) produced by Genoa Company was popular in the market, that is, enhanced graphics card, which could simulate MDA and CGA and draw graphics bit by bit on a monochrome screen. EGA has a resolution of 640x350, and can generate 16 colors of graphics and text. But these graphics cards are all digital, and it was not until the appearance of MCGA (Multicolor Graphics Array) that the prelude of analog graphics cards was opened. MCGA is an image system integrated on PS/2 models 25 and 30. It adopts analog RGA image signal, and the resolution can reach 640x480. The difference between digital RGB and analog RGB is just like the difference between switching and fine-tuning switching. A display screen using analog RGB signals will convert the voltage value of each signal into a range matching the color brightness. Only analog monitors can be used with MCGA, which can provide up to 256 colors. In addition, IBM also provides an analog monochrome display, which can display 64 colors.

VGA graphics card

VGA (Video Graphics Array) is a display graphics array. IBM is an imaging system built in its PS/2 models 50, 60 and 80. Its digital mode can reach 720x400 colors, and its drawing mode can reach 640x480x 16 colors and 320x200x256 colors. This is the first time that a graphics card can be used at the same time. ...