Atari XL User Manual

Characters 113
LOC. REG. COLR. LUM. COLOUR
708
0
28 ORANGE
709 1 12 10 GREEN
710
29
4
BLUE
711
3
4 6 PURPLE
712 4 0 0
BLACK
Default Colour Register Values
110 FOR REG=O TO 3
120 SETCOLOR REG,COLR+2*REG,12
130 NEXT REG
140 FOR DELAY=O TO 50:NEXT DELAY
150 NEXT COLR
160 GOTO 100
The colours will continue to cycle until you press
BREAK.
You can also use the POKE command to directly
alter the contents of the colour registers. Add these
lines to the last program and type GOTO 200 to
cycle
through all the colour and luminance
combinations for the screen colour, by POKEing
the colour register location (given in the table) with
every number from 0 to 255.
200 REG=710
210 FOR COL=O TO 255
220 POKE REG,COL
230 FOR PAUSE=O TO lOO:NEXT PAUSE
240 NEXT COL
250 GOTO 250
When you change character colours, you will notice
that the colour of the mode 0 window also changes,
because this is controlled by one of the registers
controlling character colours (register 2). This is a

Atari XL Specifications

General

Brand	Atari
Model	XL
Category	Desktop
Language	English