Atari 400 User Manual

Introduction to Atari BASIC 73
When System Reset is pressed, the program will stop executing ,
the display screen
will be erased, and the AT ARI will return to
the immediate mode. You may be able to resume program
execution by entering CONT . However, this is not assured. With
complex programs, chances are s lim that program exec ution can
be resu
med once System Reset has been pressed.
STOP STATEMENT
The STOP statement functions in much the same manner as
pressing the Break key. The following is an example of a program
line containing a STOP statement.
500 STOP
When the statement is executed, program execution will be
halted, and the following message will be displayed.
STOPPED AT LINE 500
The program wil l return to the imm ediate mode, where
execution can be resumed by entering CONT.
END Statement
The END stateme nt also causes program execut ion to halt. An
example of an END statement is given below.
999 END
When an END statement is executed, program exec ution will
halt, the message READY will be displayed on the screen, and the
computer will return to the immediate mode .
Execution can be resumed
with the line following the END
statement by entering CO NT.
Unlik e the STOP statement , the END statement closes any open
input / output channe l s, sets the screen to graphics mode 0, and
turns off all sound voices.

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)