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Atari XL User Manual

Atari XL
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Program
Control
41
crash
(come to
an
undignified
halt)
when
the
Atari
runs
out
of
the
memory
it
uses
to
store
all
the
line
numbers
for
the
RETURNs,
and
the
message
2
AT
LINE
xx'
will
be
displayed.
STOPPING
AND
STARTING
In
the
last
example
program
the
new
command
END
was
used
to
indicate
the
last
line
of
the
program
to be
executed.
The
command
tells
the
computer
to
stop
running
the
program.
There
is a
second
command,
STOP,
which
also
halts
programs,
but
the
two
have
slightly
different
effects.
END
stops
the
program
running,
and
the
message
is
displayed,
but
when
STOP
is
used
the
program
halts
and
the
message
AT
LINE
xxx'
is
printed
(xxx is
the
line
number
of
the
STOP
instruction).
Unless
you
need
to
know
where
the
program
halted,
END
is
the
one
to
use.
If
a
program
has
been
halted
by
one
of
these
instructions,
or
by
pressing
the
BREAK
key,
it
may
be
restarted
with
the
instruction
CONT.
The
program
will
continue
from
the
instruction
after
the
last
one
to
have
been
executed.
CONT
may
only
be
used
immediately
after
the
program
has
been
stopped.
You
may
not
use
CONT
within
programs.
ON
...
GOSUB
(GOTO)
Both
GOSUB
and
GOTO
may
be
used
in
a
second
type
of
decision
command
which
selects
one
of
a.
number
of
destinations
depending
on
the
value
of a
chosen
variable.
ON
N
GOTO
100,
200,
300
results
in:

Table of Contents

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Atari XL Specifications

General IconGeneral
Release Year1983
CPUMOS Technology 6502C
GraphicsANTIC, GTIA
SoundPOKEY (4 channels)
StorageCassette tape
PortsCartridge
Operating SystemAtari BASIC
CPU Speed1.79 MHz
RAM64 KB

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