Display Mode in Computer Graphics
Display modes of the adapter card can be categorized either as text/character mode or graphics mode.
In the text mode, the screen is internally represented as text instead of Pixel. The screen is divided into a rectangular grid (cell or referred box), each cell is capable of bold a single character only. All video standards support text mode with 25 rows and 80 columns of characters. Text mode has mono-space fonts, which means each character has an equal width on the screen. So that output can be aligned properly. Screen manipulation in text mode is faster compared to graphics mode and it requires less memory.
Graphics mode is a computer display mode that generates an image using pixels. In graphics mode, the screen is internally represented as a grid of pixels. Pixel is the smallest addressable entity on the screen. Everything including characters is represented in terms of pixels. Graphics mode supports smoother shapes and fonts. Graphical objects like a circle, line, triangle etc. cannot be displayed in text mode. As per the requirement, the application programmer can switch between text and graphics modes.
The graphics adapter supports different resolutions, colors and aspect ratios. Detail of various adapters is shown in the below table.
|Adapter Acronym||Full form||Resolution||Aspect Ratio||Color Supported|
|SXGA||Super Extended Graphics Array||1280 x 1024||5:4||224|
|SVGA||Super Video Graphics Array||800 x 600||4:3||16|
|VGA||Video Graphics Array||640 x 480||4:3||16|
|MCGA||Multi-Color Graphics Adapter||320 x 200|
640 x 480
|EGA||Enhanced Graphics Adapter||640 x 350|
640 x 200
320 x 200
|Hercules||–||720 x 348||4:3||2|
|CGA||Color Graphics Adapter||640 x 200|
320 x 200
160 x 200
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