MODEMS
A modem
is
a device
that
allows
your
computer
to send and receive information over telephone
lines.
The
word
"modem"
is
actually a com-
bination of
two
words that describe exactly
what
the device does.
It
MOdulates (or
changes) the information into a high-pitched
whistle that
is
sent over the phone line, and
then DEModulates (changes back) the high-
pitched whistle into information
when
the sig-
nals reach a computer at the other end
of
the
phone connection.
You
will learn more about the
uses
for modems in Chapter
6,
"Your Computer's
Network
."
Some
modems will need the
850
interface mod-
ule in order to
work
with
your
computer. While
modems that
don't
need the
850
interface may
Atari
830
modem
183
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