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Atari 400 User Manual

Atari 400
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Atari
810
Disk
Drive
23
1
Lo
cked files appear in the Di
sk
Directory
with
an
asterisk
before
the filename.
When
the Lock File
operation
is
specified, the
following
prompt
will
appear.
WHAT
FILE
TO
LOCK?
Ent
er the file specification
of
the
file to be
lo
cked. Filename
match cha
ra
cters may be
us
ed to
lo
ck
multipl
e files
with
a single
file specification.
It
is
good
practice
to
lock
the
DO
S.SYS
and DUP.SYS files.
G. Unlock File
The
Unlock
File
operation
is
used
to
unlock
one
or
more
disk
fil
es
pr
eviously
locked
with
Lock File.
When
the
Unlock
File
operation
is
specified, the
following
prompt
will
appear:
WHAT
FILE
TO
UNLOCK?
The file specification
of
the file
to
be
unlo
cked
should
be
entered.
Fil
ename match characters
ca
n be
us
ed
to
spec
ify
more
than
one
file.
H. Write
DOS File
The
Write
DOS File
operation
a
llow
s the user
to
copy
DOS 1.0
or
2.0
o
nto
a diskette. In
DO
S version 1.0,
the
DOS.SYS
file
is
copied. In
DO
S version
2.0,
the DOS.
SYS
and DUP.
SYS
files are
cop
ied.
DOS
is
copied
from
the
comp
uter
's memory,
not
directly
from
a
diskette
during
th e
Write
DOS
Fil
e
operation.
In
DOS 1.0, the
following
prompt
appears
when
Write
DOS File
is
specified.
TYPE
"Y"
TO
WRITE NEW DOS
FILE

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Atari 400 Specifications

General IconGeneral
ManufacturerAtari
Model400
TypeHome Computer
Release Year1979
CPUMOS Technology 6502
CPU Speed1.79 MHz
ROM10 KB
Operating SystemAtari OS
KeyboardMembrane keyboard
RAM8 KB (expandable to 48 KB)
GraphicsANTIC and GTIA chips
Sound4 channels
DisplayRF output for connection to TV
StorageOptional cassette tape drive or floppy disk drive
PortsCartridge
Display Resolution320x192 (16 colors)

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