Atari 400 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 400 Specifications

General

Manufacturer	Atari
Model	400
Type	Home Computer
Release Year	1979
CPU	MOS Technology 6502
CPU Speed	1.79 MHz
ROM	10 KB
Operating System	Atari OS
Keyboard	Membrane keyboard
RAM	8 KB (expandable to 48 KB)
Graphics	ANTIC and GTIA chips
Sound	4 channels
Display	RF output for connection to TV
Storage	Optional cassette tape drive or floppy disk drive
Ports	Cartridge
Display Resolution	320x192 (16 colors)