Atari 800 User Manual

126 User 's Handbook to the Atari 400/ 800 Computers
after GOTO . If the va lue is 2, the program continues at the
second
line number after GOTO, etc.
GRAPHICS
EXAMPLE
10 FOR I = 1 TO 3
20 ON I GOTO 40 , 50 , 60
40 PRI NT "I = 1" :GO TO 70
50 PRINT "I = 2":GO TO 70
60 PRINT "I = 3"
70 NEXT I
GRAPHICS
sets one of the graphics modes.
CONFIGURATION
GRAPHIC a
The
GRAPHICS statement generally clears the screen display
upon execution. By adding 32 to the GRAPHICS statement
argument, this feature is suppressed.
In graphics modes 1 through B, a four line text window appears in
the bottom of the display. By adding 16 to the GRAPHICS
statement argument , the text window will be suppressed.
EXAMPLE
GRAPHICS 49
The preceding GRAPHICS statement sets graphics mode 1 with
the screen clearing and text window features suppressed.
IF
The IF statement is used with a THEN statement to branch a
program if a particular condition is true.
CONFIGURA TlON
statement
IF EX THEN LN [:statement] ...

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