24 Macintosh
User's
Handbook
Figure
1.5.
Using the mouse as a pointing device
THE IMAGEWRITER PRINTER
The lmagewriter® printer
is
a serial interface,
dot
matrix
type printer designed for use with the Apple Lisa
and
Apple
Macintosh computers. Serial interface devices receive each bit
of
data
sequentially instead
of
byte by byte as with parallel
devices. This method
of
data
transfer allows a simpler design
for the computer while sacrificing little in terms
of
speed. The
printer has its own microprocessor as well as
I K byte
of
memory so
that
it can accept part
of
the computing burden
from the computer.
The
dot
matrix printing technique operates in the follow-
ing manner. The print head on the Imagewriter contains a
series
of
dot
points which operate much like pencil points.
These dots are arranged in a matrix
16
wide by 9 high. When
printing, the printer begins each line
by
placing the print head
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