Atari 800 User Manual

Atari BASIC Reference Guide 167
channel number in the OPEN statement. When a PUT statement
is used for the display following a GRAPHICS statement, the I/ O
channel number must be 6.
The I/ O channel must be open for output to an appropriate
output device.
The second argument can be any non-negative value, but the
value that is sent to the output device will always be an integer
between 0 and 255. Larger values are reduced modulo 256 .
With the Program Recorder, an OPEN statement is needed to
open an I/ O channel for device "C" . When the Program
Recorder is used for short gaps between records, the tape keeps
moving until the I/ O channel is closed. As a result, the program
must keep up with the tape or the information will not be
recorded prop er/yo
EXAMPLE
10 OPEN #1, 8, 0, "c"
20 FOR I = 1 TO 100
30 X = INT(RND(9) * 100)
40 PUT #1, X
50 NEXT I
60 END
The
previous e xample c ontains a program that records 100
random numbers . Line 10 is an OPEN statement that opens I/ O
channel number 1 for output to the Program Recorder. Line 20is
a FOR statement that begins a FOR/ NEXT loop that is repeated
100 times. Line 30 sets X equ al to a random integer between 0 and
100 .
Line 40 contains a PUT st a tement that sends the value of the
variable X to the output device on I/ O channel number 1. Since
the
I/ O chann el is open for output to the Program Recorder , the
values of the variable X are recorded on the cassette tape. When
the FOR/ NEXT loop has been executed 100 times, the END
statement at line 60 closes the I/O channel and ends the
program.

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