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Paper is automatically
moved up one line after each line
is
printed
or
whenever
a line feed
(LF)
control code
is
sent by the host device.
When
a
line feed
is
to be executed, the line feed solenoid
is
momentarily energized
which causes
the paper feed roller to
move
the paper one line.
The automatic
line feed function
may
be disabled.
However,
if
this function
is
disabled,
the host device
must transmit
at least one LF
command prior to sending
a
print
command
(CR)
or a full line of
character data
or
overprinting will occur.
Line feed
(LF)
commands may
be intermixed
with input character data
and multiple line feed commands
may
be sent by the host device.
A special
line feed buffer
is
provided which can store up to
255
pending line
feeds.
The initial line feed received causes an immediate advance of one
line.
Because of the time required to execute
a
line feed
is
relatively long
(160
milliseconds) with respect
to the input
data rate
(9300
characters
per second)
subsequent line feeds are stored as a count
in
the line feed buffer.
All line
feeds are executed prior to printing the line of data.
The printer uses a Mobius strip ribbon configuration which allows
printing on the upper and lower portions of
the
ribbon on alternate passes of
the ribbon thereby increasing ribbon life.
The ribbon drive motor
(ac)
is
energized at all times except when the print head
is at the
left-most position.
This insures proper movement of
the ribbon through the ribbon
path and compen-
sates
for the
movement of
the
print head
in
both forward and reverse directions.
1-6
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