Atari 800 User Manual

102 User's Handbook to the Atari 400/ 800 Computers
GRAPHICS MODES 3, 5, and 7
COLOR NUMBER DEFAULT COLOR
o ORANGE
1 GREEN
2 BLUE
3 BLACK
As a result, when T=O, the color is orange. The PLOT statement at
line 50 colors the pixel at column 0, rowO orange. The next pixel,
at column 1, row 0 is colored green. The pixel at column 2, row 0
is blue and the next one is black.
In
graphics modes 4 and 6, the COLOR state ment is used in the
same fashion as in graphics modes 3, 5, and 7. However , modes4
and 6 have only two colors, and the default colors are as follows.
GRAPHICS MODES
4 and 6
COLOR NUMBER DEFAULT COLOR
o BLACK
1 ORANGE
Graphics mode 8 has only one color , with two brightness levels.
As a result, the COLOR statement is used to select the brightness
of a pixel. I n other words, COLOR 1 causes the next plotted pixel
to be visible. COLOR 0 causes the next plotted pixel to be the
same
as the background .
In graphics mode 8, the pixels are very small, and the graphics are
slow. It sometimes is useful to draw an entire area, then "erase"
what is not wanted. This is often faster than drawing only what is
wanted. This can be done by drawing an area using COLOR 1,
then
"erasing" by using COLOR O.
COM
COM is used interchangeably with DIM in dimensioning strings,
arrays, and matrices.

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