Atari 800 User Manual

Atari BASIC Reference Guide 155
The paddle controllers are used only in pairs. A pair of
controllers is plugged into one of the controller jacks on the
front of the computer. The first jack accepts paddles 0 and 1. The
second jack accepts paddles 2 and 3, etc.
If a paddle is rotated fully clockwise, the value 1 is returned. The
value increases
as the paddle is rotated counter-clockwise. The
maximum value returned is 228.
EXAMPLE
10 IF PADDLE (1)=150 THEN END
20 GOTO 10
The previous example consists of a program that executes line 10
repeatedly until the paddle is rotated more than halfway
counter-clockwise. Since PADDLE (1) specified, the paddles
must be
plugged into controller jack 1.
PEEK
The PEEK function is used to recover the value in a memory
location.
CONFIGURATION
X = PEEK (a)
A memory location contains an integer value between 0 and 255.
The argument of a PEEK statement refers to the memory
location. A value error occurs if the argument is negative or
greater than 65535. If the argument (a) is not an integer, it is
rounded off.
Many memory locations are of general interest. The contents of
a memory location can be changed with a POKE statement.
Appendix E contains information about commonly used
memory locations.
EXAMPLE
PRINT PEEK (83)
39

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