Atari 400 Basic Reference Manual

aexp1
aexp2
filespec
Code
number to determine input or output opera -
tion.
Code 4
8
12
6
9
input operation
output operation
input and output operation
disk directory input operation
(In this case, the filespec is the search specifica-
tion.)
end-of-file
append (output ) operation. Append is
also
used for a special screen editor input mode .
This mode allows a program to input the next
line from E: without waiting for the user to press
lim!Jm.
Device-dependent auxiliary code. An 83 in this
parameter indicates sideways printing on a printer
(see appropriate manuals for control codes ).
Specific file designation. Must be enclosed in quota-
tion marks. The format for the filespec parameter
is shown in Figure 5-2.
"D 1 : A T A R I 8 0 0 . B A S"
-
__ ____.Jl ...... V' , ~
Device -----.:1•
Code
Device
Number
(optional)
Required -------'
Colon
File name --------------'
(up to 8
characters-
must begin
with alphabetic
character)
Period required -------------..l
as separator if
extender is used.
Extender-------------------~
(optional)-
Includes
0-3 characters
Figure 5-2 Filename Breakdown
Note: Filenames are
not used with
the program
re c order.
The CLOSE command simply closes files that have been previousl y opened with
an OPEN command. Note in the example that the aexp following the mandator y
#charact er must be the sam e as the aexp r efere nce number in the OPEN state -
ment.
IIO Commands and De vices 27

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)