Atari 400 User Manual

I ntroduction to Atari BASIC 69
altered to any line number desired. The most commonly used
branching statements in BASIC are GOTO and GOSUB.
GOTO takes the following format:
GOTO lin e numb er
For example, the following program statement:
500 GOTO 999
999 END
would branch program control at line 500 to line 999 .
Branching statements are
often used in conjunction with
conditional statements. In such a situation, the normal execution
of the program is altered depending upon the outcome of the
condition set up in the IF statement. This is shown in the
following example.
050 DIM A$(99)
100 PRINT "ENTER THE AMOUNT"
150 INPUT A
200 IF A == 0 THEN GOTO 900
900 PRINT "ARE YOU FINISHED (YIN)": INPUT A$
910 IF A$ == "N" THEN 100
999 END
In our preceding example, if the value input for A has a zero
value, then the program will branch to line 900 where the
operator will be prompted whether he has finished entering
data. In line 910, the program will set up a condition where if the
input was 'N ', the program will branch to line 100 . If the entry was
not equal to 'N', the program will continue to line 999.

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)