Atari 400 User Manual

180 User's Handbook to the Atari 400/ 800 Computers
STOP
The STOP statement causes a halt in the execution of a BASIC
program.
CONFIGURATION
STOP
When a STOP statement is executed, the computer will return to
graphics mode o. If STOP is executed in the program mode , the
following screen message will be display ed;
STOPPED AT LINE XXX
where XXX is line number where STOP was executed. If STOP is
executed in the imm ediate mode, this message will not appear.
CaNT can be used to rescue program execution after it was
halted by executing STOP.
EXAMPLE
100 INPUT A
105 IF SGN (A) = -1 THEN 150
110 B = SQR (A)
120 IF SGN (B)<>l THEN STOP
130 PRINT B
140 GOTO 100
150
END
In the preceding example, if a value of 0 is input for A in line 100,
program execution will stop and the following message will be
displayed.
STOPPED AT LINE 120
By entering CONT, program execution will resume with line 130.

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)