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each time the key is pressed. The 1132 Stop, Car-
riage Space, Carriage Restore, and Carriage Stop
keys operate in a similar manner.
Stop Key. This line is active once for each time the
stop key is pressed. See Start Key.
Carriage Space Switch. This line is active once for
each time the carriage stop key is pressed. See
Start Key.
Carriage Restore Switch. This line is active once
for each time the carriage restore key is pressed.
See Start Key.
Carriage Stop Switch. This line is active once for
each time the carriage stop key is pressed. See
Start Key.
Motor on Switch. This line is active continuously
when the 1132 motor switch is turned on.
Carriage CB. This line is activated for . approxi-
mately lOµsec when the carriage CB contact
closes.
Interposer Contact. This line is active when the
interposer contact is closed.
Carriage Brush
1
through
6, 9,
and
12.
Any of
these lines is activated when its carriage brush
makes contact on the brush commutator. The line
signals the using system circuits when a carriage
control tape hole is sensed and tells which tape
channel the hole is in.
CB Clock. This line is active when the Print Disk
Clock solar cell senses a slot in the outer circle of
slots of the timing disk. Light through the slot
striking the solar cell affects the input to an ampli-
fier circuit. The output of the amplifier, by the use
of a diode clamping circuit, develops the CB Clock
line.
Print Disk Bit 0 through 7. Any of these lines is
activated by a solar cell sensing a slot in its corre-
the input to an amplifier circuit, and the amplifier
output is a Print Disk Bit line.
CIRCUIT DESCRIPTION
Carriage Operations
Carriage Space
Any carriage operation is started by energizing one of
the carriage magnets.
A
single space uses the clutch
magnet only, and it is energized by activating the
carriage magnet select line to the 1132. This line
may be activated from an instruction or by receiving
a carriage space switch signal when the carriage
space key is pressed. Platen motion starts and when
the carriage CB closes, its signal blocks the car-
riage magnet select line. The clutch magnet is de-
energized, and the platen stops in a detented position.
Carriage Skip
In
a carriage skip operation the interposer magnet is
energized first. The interposer magnet select line
may be activated from an instruction or by receiving
a carriage restore switch signal when the carriage
restore key is pressed. When the interposer magnet
armature is attracted, the interposer contact closes,
and its signal conditions the circuit to activate the
carriage magnet select line. This line energizes the
clutch magnet, and platen motion starts.
If
the skip was started by pressing the carriage
restore key, sensing a control tape channel
1
hole
signals a skip stop. The next carriage· CB impulse
blocks the circuits which are energizing the inter-
poser and clutch magnets. The carriage clutch
latches up, and platen motion stops.
A
programmed skip is terminated by a stop car-
riage instruction. The using system program deter-
mines when the instruction is given. The next car-
riage CB impulse blocks the circuits which are
energizing the interposer and clutch magnets. The
clutch disengages and platen motion stops.
Printing Operations
sponding row of the timing disk. There are eight
Pressing the carriage stop key on the printer while
similar circuits in the 1132 printer-which-activate----any-skip-is-in-pl'ogress-sets-up-a-skip-stop-condition--
the eight lines. Light through a slot in the timing
in the CPU circuits. The following carriage CB im-
disk strikes a solar cell. The solar cell output is
pulse stops platen motion as previously described.
3.2
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