Atari 400 User Manual

Atari BAS IC Reference Guide 111
A program that is in me mory will not be affected by a DOS
statement in version 1.0. However , disk operatio ns J or 0 will
erase the contents of the memory . For example, if a program is in
memory, and a DOS command is exec uted, followed by
DUPLICATE
DISK or DUPLICATE FILE, the program will be gone
when the system returns to BASIC.
IblSK OPERATING SYSTEM II
COPYRIGHT 1980 ATARI
VERS ION 2.0S ""
A. DISK DIRECTORY I. FORMAT DISK
B. RUN CARTRIDGE
J. DUPLICATE DISK
C. COpy FILE
K. BINARY SAVE
D. DELETE FILE(S)
L. BINARY LOAD
E. RENAME FILE
M. RUN AT ADDRESS
F. LOCK FILE N. CREATE MEM.SAV
G. UNLOCK FILE O . DUPLICATE FILE
H. WRITE DOS FILES
'"
In DOS 2.0, DOS consists of 2 files, DOS. SYS and DUP.SYS.
DUP.
SYS must be present on the diskette in drive 1 or the Atari
will return to BASIC. DUP .S YS was a portion of memory where
BASIC programs normally reside. In order to save any BASIC
program residing in this area of memory , the Atari will save that
program onto the MEM . SAV file on drive l--if that file exists.
Once these operations hav e been completed , the DOS utilities
menu will appear. You ca n ret urn to BASIC by choosing menu
item B or by pressing the System Reset key.

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)