Atari 800 User Manual

80 User's Handbook to the Atari 400 / 800 Computers
In this example, E E represents pressing the Escape key twice, and
t represents pressing Escape Ctrl--.
The various escape sequences are given in Table 4-1.
Table 4-1. Escape Sequences
ASCII
Echoed
Keyboard Entry Code
Character
String Character
ESC/ESC 27
~
Escape Code
ESc/CTRL-- 28
II]
Cursor Up
ESC/CTRL-=
29 [!]
Cursor Down
ESC / CTRL-*
30
~
Cursor Right
ESC/CTRL-+
31
~
Cursor Left
ESC / CTRL-<
1 25
~
Clear Screen
ESC/SHIFT-<
1 25
~
Clear Screen
ESC/BACK S
126
~
Cursor left, replace with
blank space
ESC/TAB
127
~
Cursor right to ne xt
tab stop
ESc/SHIFT-BACK S
156
0
Delete Line
ESC/SHIFT-> 157
U
Insert Line
ESC/CTRL-TAB
158
C
Clear Tab Stop
ESC /S HIFT-TAB
159
=
Set Tab Stop
ESC/CTRL-2
253
13
Sound Built-in Speaker
ESC/CTRL-BACK S
254
D
Delete Character
ESC / CTRL-> 255
D
In se rt Character
Graphics Characters in Strings
The Atari has 29 graphic characters. These are output by using
the Control key in combination with a nother key. Table 4-2
contains a
list of the graphics characters.
The graphics characters can be includ ed in a string with a PRINT
statement to output graphics to the sc ree n. For example, the
following program,

Atari 800 Specifications

General

Processor	MOS Technology 6502
Processor Speed	1.79 MHz
ROM	10 KB
Graphics	ANTIC and GTIA chips
Release Year	1979
Display Resolution	up to 320 x 192
Colors	128 colors
Sound	4 channels
Storage	Cartridge, cassette, floppy disk
Ports	Cartridge, serial, monitor
Operating System	Atari OS