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Laser 128 User Manual

Laser 128
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SOME
BACKGROUND IN BASIC
PROGRAMMING
2 SOME BACKGROUND IN BASIC
PROGRAMMING
When BASIC is
started,
it
displays
the
prompt
"]"
.
This
means
that
it
is
ready
to
accept
commands
from
the
keyboard.
At
thi
s
command
level,
it
can
be
used
in
either
of
two
modes:
Direct
-
which
is
when
you
enter
a
command
and
have
it
executed
immediately.
Indirect
-
which
is
when
command
lines
are
started
with
line
numbers,
and
a
program
is
built
up
for
later
execution.
2.1
LINE
FORMAT
In
the
direct
mode,
the
BASIC
commands
and
functions
are
entered
as
they
are
.
In
the
indirect
mode,
program
lines
like
the
one
following
are
entered:
nnnnn
BASIC
statement
(:
BASIC
statement
..
. ) Where
nnnnn
is
the
line
number.
The
parentheses
indicate
options.
The
length
of
your
line
is
limited
to
239
characters,
and
a
line
input
is
terminated
when
you
hit
the
RETURN
key.
Hitting
RETURN
adds
a
non-printing
carriage
return
character
at
the
end
of
a
line.
The
BASIC
interpreter
takes
this
carriage
return
as
indicating
the
end
of
a
program
line.
II-12

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Laser 128 Specifications

General IconGeneral
ProcessorMOS Technology 6502
RAM128 KB
ROM32 KB
CompatibilityApple II
Graphics280×192
SoundBuilt-in speaker
PortsComposite video
Operating SystemApple DOS 3.3, ProDOS
Storage5.25" floppy disk drive (optional second drive)