Atari XL User Manual

148 The A tar; XL Handbook
(0
The Joystick Positions given by STICK( )
controller of the specified paddle. PTRIG() is used
to read the Fire button of a paddle.
The program listed below uses a joystick to control
the drawing of lines on a graphics display.
10 REM JOYSTICK ARTIST
20
REM SET UP VARIABLES AND
LABELS
100 POKE 752,1: PRINT
" i i .SKETCHPAD"
110 GOSUB 20000
192 REM FIND JOYSTICK PORT
200 PRINT" iii i .PRESS FIRE TO
START"
210 PORT=O
220 IF STRIG(PORT)=l THEN PORT=
PORT=O:
GOTO 220
992 REM PICTURE
1000 GRAPHICS 7
1010 X=O:Y=O
1020 GOSUB MESSAGE
1030 POKE 82,0
1040 GOSUB COLOUR

Atari XL Specifications

General

Release Year	1983
CPU	MOS Technology 6502C
Graphics	ANTIC, GTIA
Sound	POKEY (4 channels)
Storage	Cassette tape
Ports	Cartridge
Operating System	Atari BASIC
CPU Speed	1.79 MHz
RAM	64 KB