24
Apple
lie
Users
Handbook
Data may be sent
from
the
computer
to
the
receiving device
(printer
or
video
display)
in
two
different
manners; serial and
parallel.
In
parallel
communications,
the
8 bits
representing
a
character are all sent at
one
time
to
the
receiving device. In serial
communications,
each
of
the
8 bits are sent
one
at a
time
to
the
receiving device. Generally, printers
use
parallel
communication.
A
wide
range
of
printers
are available
for
use
with
the
Apple
lie.
The
printer
interface
card can be installed in slots 1-7
in
the
main
board.
Generally,
openings
7,
10, 11,
or
12
on
the
rear
of
the
lie
are used
for
the
installation.
The use a
printer
with
the
Apple
lie
will
be covered in greater
detail in
Appendix
H.
Hand Controls
The
9-pin
connector
in
the
lle's
rear panel
is
generally
used
for
the
installation
of
hand
controls
such
as
game paddles, a j9ystick,
etc.
A Game
1/0
Connector
is
also available
on
the
main
board
(see
Illustration
1-2).
Controllers
using a 16-pin
connection
can be
attached via
the
connector
.
Apple
lie
Controller Cards
Earlier in this
chapter,
we
mentioned
the
seven
plug-in
slots
on
the
Apple's
main board. The slots
were
designed
to
accept
special
circuit
boards
known
as
controllers
or
cards.
Cards are available
for
a
number
of
different
applications. For
example
as
we
mentioned
previously, a parallel
or
serial
communications
card
is
required
to
install a
printer
on
your
Apple
lie.
Controller
cards are
required
for
installing a disk
drive
with
you
Apple
lie.
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