of
the
program
that
you
enter
into
the
computer.
You
will avoid this problem by
purchasing
a
book
containing programs
that
have been tested on
theTI-99/4A.
When
you
buy
blank
cassettes
to
type
programs
ofyour own, try to getshort ones
(15
or 20
minutes) because
they
are less expensive
and
generally more durable. Wheneveryou buy pre
packaged software, make sure
that
you
get
a
factory-sealed package. Also be certain
that
you
can
return
a defective or
damaged
cartridge,
cassette,
or
disk.
Most pre-packaged software iscopyrighted.
When
you
buy
programs of this type,
you
can
not
legally copy them and give or sell them
to
anyone else. Programswhich are published in
books
and
magazines, however, are publicdo
mainsoftware. Software
written
by
your
friends
may also be in the publicdomain—that is,it is
not
copyrighted and isavailable for use by
the
general public,usuallywithout a fee. Some com
panies even sell public domain software; they
type
the
program into a computer, save it
on
a
cassette
or
disk,
make
copies,
and
sell
them.
Fees
for public domain software
are
generally very
low—perhaps
S5
per
program
to
cover
the
costs
of
making
the
copy.
185
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