Atari 800 User Manual

Atari BASIC Reference Guide 151
Table 5-2. Screen I/O Operations
OPERATION
NUMBER
8
12
24
OUTPUT INPUT TEXT CLEAR
WINDOW SCREEN
NOTE: The screen is always clear in graphi cs mode O.
Graphics mode 0 has no separate text window.
When the screen is used w ith an OPEN statement instead of a
GRAPHICS statement, the PLOT and DRAWTO statements
cannot be used. Input and output is performed with PRINT, PUT,
and GET statements. Each of these statements require an 1 10
ch anne l numb er that corresponds to the OPEN statement
channel number .
EXAMPLE
10 GRAPHICS 8
20 COLOR 1
30 PLOT 0,0
40 DRAWTO 10 , 10
50 OPEN #1, 60, 8, "S :"
60 POSITION 5,5
70 GET #1, X
80 PRINT X
90 END
The
previous example contains a program that uses the screen as
an input device. Line 10 has a GRAPHICS statement that indicates
graph i cs mode 8. Line 20 chooses color number 1. Lines 30 and 40
draw a sma ll diagonal line in the upper left of the display.

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