Describes
programs capable of displaying only
ASCII (and
extended ASCII)
characters. Character-based programs treat a
display screen as an
array of boxes, each of which can hold one character. When in
text mode, for example,
PC screens are typically divided into 25 rows and 80
columns. In contrast,
graphics-based programs treat the display screen as an array of millions of
pixels. Characters and other
objects are formed by illuminating patterns of pixels.
Because the IBM extended ASCII character set includes shapes for drawing pictures, character-based programs are capable of simulating some graphics objects. For example, character-based programs can display windows and menus, bar charts, and other shapes that consist primarily of straight lines. However, they cannot represent more complicated objects that contain curves.
Unlike PCs, the Macintosh computer is a graphics-based machine. All programs that run on a Macintosh computer are graphics based.
