Overview
of the Moe
25
over the beginning
of
the line
and
striking the page through the
typewriter ribbon. When the operation
is
complete, the print
head moves on
to
the next position on the page. Each time a
dot
passes over a position to be printed, the pencil point shoots
out and strikes the paper.
The Imagewriter was designed to print one character
within the print head space,
but
the Mac uses it differently
treating each
dot
on the print head as if it were a pixel
on
the
screen. This way, the printer
can
print lettering
of
any size.
Another design feature
of
the Imagewriter
is
its ability to
accommodate both single sheet and tractor-fed paper. This
allows the user to print letters
on
his
or
her company's letter-
head
or
to
print long reports without constantly inserting
paper.
OPTIONAL DISK DRIVE
The Mac features two serial ports on its back panel which
can be used to connect the Mac
to
various peripheral devices.
One
of
those optional devices is the optional disk drive. The
disk drive available from Apple
is
constructed like the internal
disk drive provided
on
the basic
unit.lt
uses a serial
data
bus as
does the printer.
The advantage to having
an
extra disk drive connected to
your Mac
is
that it allows easier
data
handling when two disks
are involved in
an
operation. This happens quite often since
more
than
two-thirds
of
a disk can be taken up by the operating
system, applications software,
and
other essential files leaving
little space for text files.
Most Mac applications create text files which can occupy
a sizable
amount
of
space. Since the Mac's internal memory
is
relatively small*, it must refer
to
the disks often when perform-
ing various operations. When two disks are involved, these
*
We
are assuming 128K. This may be expanded at some future date.
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