Atari 800 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 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