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Atari 400 User Manual

Atari 400
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Atari
810
Disk
Drive
243
If the
program
file specified by
ENTER
or
LOAD
is
present
on
the
specified
drive, it
will
be loaded
into
memory
.
When
the
loading
process
has
been
completed,
the READY
prompt
will
be
displayed.
If
the
program
specified by
ENTER
or
LOAD
is
not
present
on
the
drive
indicated,
error
170
(File
Not
Found)
will
occur.
The
LOAD
statement
will
erase any existing
program
in
memory
when
the
new
program
is
loaded. The
ENTER
statement merges
the
program
being
loaded
with
any existing
program
lines in
memory
.
If
the
program
being
loaded contains
line
numbers
which
duplicate
those
of
the program in
memory,
the
incoming
program lines will replace the
duplicate
lines in
memory.
Any
existing
program
lines in
memory
can be erased by
entering
the
NEW statement
before
executing
an
ENTER
statement.
LOADing and Executing a Program
In the
following
series
of
statements, a BASIC
program
is
loaded
with
the
LOAD
statement, and then executed
with
the
RUN
statement.
LOAD
"D:PROGA.BAS"
READY
RUN
This process can be shortened
to
a single step by
including
the
LOAD
statement's
parameter
with
the
RUN statement.
An
example
of
this usage
of
the
RUN statement
is
given
below
.
RUN "D:PROGA.BAS"
In
the
preceding
example, PROGA.
BAS
will
be executed
as
soon
as
it
is
loaded.
Chaining Programs
The RUN statement can be
included
as
a
program
line
in
one
program
in
order
to
load and execute
another
program.
This
process
is
known
as
chaining.

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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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