Atari 800 User Manual

Atari 410 Program Recorder 199
and RS-232 port.
The following is an example of an OPEN statement used to open
a data file for access by the 410 Program Recorder.
OPEN # 1,4,0, "c:"
The first parameter in the OPEN stateme nt indicates the
channel. Before an external device can be accessed either for
input or output, a cha nn el to the device must have been opened.
The OPEN statement assigns a channel to an external device.
Once a channel is assigned, the device can subsequently be
accessed via its
channel numb er. Only one channel can be open
at anyone time. If an OPEN channel attempts to open a channel
which is already open, an error will occur.
The second parameter in the OPEN statement indicates the
activity for which the channel is being opened . For th e 410
Program Recorder, a value of 4 indi cates the channel is being
opened to read data while a value of 8 indi cates the channel is
being opened to write data. A cassette file cannot be
simultaneously open for both input a nd output.
The third parameter in the OPEN statement is 0 for standard data
files. The final parameter , device, must be specified as "C:" for
input or output to the 410 Program Recorder.
When a cassette data file is opened for input or output, the
Atari's speaker will be sounded once for input or twice for
output to signal the operator to properly position the tape. Once
the tape has been properly positioned, the user should pr ess the
410's play button, and then press any key on the Atari.
If the file was opened for output, the computer will write the
leader. If the file as opened for output, it will read the leader.
This process r eq uir es approximately 20 seconds.
Once the l eader has been read or written, the program must
read or write data to the open file. If the file was opened for
output, data mu st be written to the file. If the program fails to

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