1/ Description Of The Printer Controller - Radio Shack TRS-80 Operation Manual

1/
Description of the
PTC
-64
Printer Controller
Open
the
package and
take out the
PTC-64.
Do
not
throw
away
the
packing material or
the
box.
They
may
be useful
if
you
ever
need
to transport the Printer Controller or
send
it
through the mail.
The PTC-64
package
includes:
•
A
PTC-64
Printer Controller.
• An
AC
adapter.
•
This operation manual.
Figure
1.
PTC-64
(Front View)
© POWER
Lamp
This
lamp
will
be
ON
whenever
the Printer Controller
is
powered
up.
©
STATUS Lamp
This lamp
reflects
the
various conditions of the
buffer:
•
When
the buffer
is
empty,
it
is
OFF.
•
When
the buffer
is
active (either printing,
receiving
data,
or
both),
it
will be green.
• When
the
amount
of
memory
remaining
is
less
than 4K,
the
Lamp
will turn yellow.
•
When
the buffer
is
completely
full,
the
Lamp
will turn red.
®
FAULT
Lamp
Whenever
there
is
a printer
problem
(for instance,
when
the printer
is
OFF-LINE
and you're
attempting
to print) this
lamp
will turn
on and
a
beeper
will
sound
eight times.
The
Printer Controller will not print or accept data until the fault
condition
is
solved.
Then
it
will
continue printing
where
it
left off.
©
CLEAR
Key
This
key
serves a dual purpose:
• When
the
Controller
is
inactive
(STATUS Lamp
is
OFF),
it
marks the buffer
memory
to
indicate the
starting
point for printing
and
clears
any previous buffer
contents.
•
When
the Controller
is
active
(STATUS Lamp
is lit
any
color),
it
simply
aborts
any
printing in progress.
The
information
in
the buffer
remains
intact.
To
initiate
printing again,
you must
press the
COPY
key. Printing will then
start
from
the
beginning
(if
CLEAR
was
pressed
to
mark
the starting point).
To
erase the
information, press
CLEAR
a second time instead of
COPY.