CST8174_Lecture_15_Video_Cards(2)

CST8174_Lecture_15_Video_Cards(2) - Algonquin College...

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Tuesday, May 12, 2009 Matthew O’ Meara 14- 1 Algonquin College CST8174 CST8174 Computer Technology Basics Video Cards
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Tuesday, May 12, 2009 Matthew O’ Meara 14- 2 Algonquin College CST8174 Video Cards The monitor itself is merely an output device that translates video signals into a visual image The video card typically converts digital information to analog information that can be displayed on the monitor
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Tuesday, May 12, 2009 Matthew O’ Meara 14- 3 Algonquin College CST8174 Video Memory Card types Text Graphic
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Tuesday, May 12, 2009 Matthew O’ Meara 14- 4 Algonquin College CST8174 Video Card Types Text Simple to use and cheap to make Only 256 possible characters and no color choices were originally available Screen allowed for 80 characters and 24 rows Each character required one byte of memory 80 characters X 24 rows = 1,920 bytes
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Tuesday, May 12, 2009 Matthew O’ Meara 14- 5 Algonquin College CST8174 Video Card Types Graphic Allowed access at the pixel level With monochrome each pixel required one bit to store on or off First graphic cards ran at 320 X 200 pixels 320 X 200 = 64,000 bits or 8,000 bytes The text video cards have been obsolete for many years so lets focus on graphic video cards
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Tuesday, May 12, 2009 Matthew O’ Meara 14- 6 Algonquin College CST8174 Color Depth The color depth refers to the number of bits used to describe the color of a single pixel The bit depth determines the number of colors that can be displayed at one time The number of colors available will always be a power of 2
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Tuesday, May 12, 2009 Matthew O’ Meara 14- 7 Algonquin College CST8174 Color Depth A simple color depth chart Bit Depth Number of Colors 1 2 2 4 4 16 8 256 16 64K 24 16.7 million 32 4 billion
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Tuesday, May 12, 2009 Matthew O’ Meara 14- 8 Algonquin College CST8174 Video Standards As technology improves so does the capabilities of video cards Let’s look at some of the standards for video cards MDA CGA EGA PGA VGA XGA SVGA
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Tuesday, May 12, 2009 Matthew O’ Meara 14- 9 Algonquin College CST8174 Video Standards MDA Monochrome Display Adapter Oldest conventional video card Only supports text modes CGA Color Graphics Adapter First card to offer color text and graphics modes Allowed support for up to four colors in graphic mode
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Tuesday, May 12, 2009 Matthew O’ Meara 14- 10 Algonquin College CST8174 Video Standards EGA Enhanced Graphics Adapter Total of 64 possible colors Only 16 colors are available in the palette at any one time Common video mode 640 X 350 X 16 colors Required more memory 128KB was standard
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This note was uploaded on 04/17/2008 for the course CST CST8174 taught by Professor Matthewo'meara during the Winter '08 term at Algonquin College.

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CST8174_Lecture_15_Video_Cards(2) - Algonquin College...

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