Atari 800

TABLE 9.4-TABLE OF SETCOLOR "DEFAULT" COLORS*
Set color
Defaults To
Luminance
Actual Color
(Color Register)
Color
0
2
8
ORANGE
1
12
10
GREEN
2
9
4 DARK BLUE
3
4
6
PINK OR RED
4
0
0
BLACK
* "DEF AULT" occurs if not SETCOLOR statement is used.
Note: Colors ma y vary depending upon the television monitor t ype, condition,
and adjustment.
A program illustrating Graphics mode 3 and the commands explained so far in
thi s section is shown below:
10 GPAFHICS 3
2'€1 ~: ; ETCOLO F 0 .~ 2 _, B = C :OL!)P 1
30 PLOT 17 .. 1 : DF.'At.JTO 1 7 .. 1 0 : DPAl·JTO 9 ·' 1 :: :
40 PLOT 19 .' 1 : DRAL·HO 19 .. 1:::
50 PLOT 20 .. 1 : D~~AL.JTO 20 .. 1 E
60 PLOT 22 .. 1 : DRA ~.JT O 22 .. W: D~:A~·lTO 30 , 18
70 POKE 752 .. 1
8(1 F'P HH ; F'P WT II AT A~ : I FEF~:~~Gt · iAL COi·1P
UTEP~:;"
9(1 I~OTO 9(1
The SETCOLOR and COLOR stateme nt s set the co lor of the points to be pl otted
(see Table 9.5). The SETCOLOR co mmand loa ds col or regist er 0 w i th hue 2
(orange) and a luminan ce of 8 ("norma l"). The next 4 lines p lot th e points to be
displayed. Line 90 suppresses the cursor and lin e 100 prints the string expres-
sion ATARI PERSONAL COMPUTERS in the te xt window (6 spaces in).
Not e th at the background color was never set becaus e the default is the d es ir ed
col
or (black).
If th e program is ex ec ut ed, it will print the Atari logo in th e graphics window
and the string expression in the t ex t window as in Figure 9-3.
Graphic Modes and Comm a nds 51