260
Macintosh
User's
Handbook
Communications Equipment
Most modems used in
computer
communications require
a serial interface
to
connect
to
the computer. This fits in well
with the Mac since it
is
designed to use serial interface equip-
ment exclusivly. The modem which Apple distributes for the
Mac comes in two models.
The
first model operates
at
300
baud. The
baud
rate
is
an
indication
of
the speed
at
which the
modem transmits data.
One
baud
is
about
one bit per second
of
data
transfer. The other, more advanced Apple modem can
operate
at
300
and
1200
baud.
The 1200
baud
rate is usually
advantageous when transferring large quantities
of
informa-
tion. Due to lack
of
availability,
we
will
not
utilize the Apple
modem for
our
examples.
The
Apple modem should operate
much the same as the Hayes modem which
we
will use here.
THE HAYES MODEM
As noted above, the modem which
we
will use for this
chapter
is
the Hayes direct connect modem.
It
operates as the
Apple modem does
and
is
offered in 300
or
300/ 1200
baud
models.
We
will use the 300
baud
model. The Hayes modem
requires a separate electrical connection and uses a power
converter to change the normal
120
VAC from the wall socket
to 3.5 VAC needed to power the modem. The modem also
requires a cable
adapter
to connect with the Mac. The cable
adapter
is
available
at
most
computer
and electronics stores.
It
is
designed to mate the Mac's 9-pin connections with the Hayes
modem's
27
pin connection. Although the latter connector
is
much larger, the Hayes
modem
uses only 6 pins. Therefore, no
special wiring is necessary to connect the modem.
Follow the installation instructions accompanying the
modem and connect it
to
the Mac. The instruction manual for
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