Atari 400 User Manual

Atari 810 Disk Drive 245
The second parameter in the OPEN statement indicates the
activity for which the channel is being opened. The activities
which can be specified for the Atari 810 Disk Drive are listed in
Table
7-1.
The third parameter in the OPEN statement is ignored when the
Atari 810 is specified as the device. A value of ° should be used.
The final
parameter in the OPEN statement consists of the device
name for the Atari 810 Disk Drive (D), followed by an optional
drive specifier, and the name of the file to be opened .
Table 7-1. OPEN Statement Task Parameter Values
(Atari 810 Disk Drive)
Task Parameter Task Description
Number
4 Disk read operation. The file pointer is
positioned to the beginning of the file.
6 Disk directory read operation . This
operation allows the user to read the
disk directory as if it was a data file. The
file pointer will be set to the first
filename in the directory that matches
the specified filename.
When the disk directory file is read, the
fields containing filenames which match
the filename specified in the OPEN
statement will be returned . Filenames
that
do not match will be skipped. The
last value
that is returned is the number
of free sectors.
If the following OPEN statement was
specified;
OPEN #1 ,6,0, "D:*.BAS"

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)