Atari 400 Basic Reference Manual

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

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)