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- When you type with your word
- processor, characters are added to
- the screen. If you look closely,
- you'll see that the characters are
- composed of dots.
- One of the expansion cards,
- called a display card, is for the
- monitor. The simplest card can
- display only ASCII text on the
- monitor. A Hercules card can
- display text and two color (black
- plus one color) graphics. This is
- called monochrome. A CGA card can
- display text in up to 16 colors or
- graphics in up to 4 colors. An EGA
- card can display text and graphics
- ~
- text 333 13 0 1 1
- in a higher resolution, meaning
- more, smaller dots, in up to 16
- colors. And a VGA card is even
- higher resolution and can handle
- up to 256 colors.
- The monitor does not know about
- text. All it knows is how to put
- dots on the screen. The display
- card has to tell it about every
- character, number and punctuation
- mark it shows. For instance, a ?
- is composed of these dots:
-
- (see next screen)
- ~
-
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