jackshaft:
A mechancial device in the tape unit that
transfers motion from the motor
(via
a belt)
to
the
spindle.
KBD: Keyboard.
kVA:
Kilovolt amperes.
LED: Light emitting diode.
logical
record: A group
of
data independent
of
its
physical location.
loop:
A group
of
instructions that are executed
repeatedly.
LWR:
loop
write read.
MAP:
Maintenance analysis procedures.
MOl:
Maintenance and diagnostics integrated.
MHz:
Megahertz.
ms:
Millisecond.
N/C:
Normally closed contact.
N/O:
Normally open contact.
nonexecutable
ROS: Contains microinstructions that
are first loaded into
read/write
storage and executed
from there.
ns: Nanosecond.
NTF: No trouble found.
numeric
keys: That portion
of
the keyboard that
resembles a calculator keyboard.
pc:
Printed circuit.
pc
board:
A printed circuit board consists
of
electrical
circuits mounted on a board
to
distribute signals and
voltages.
PG: Parity generator.
PH: Polarity hold.
PLFP: Print line failure position.
POR: Power on reset.
0·2
power
on
reset: A signal occurring during power up,
used
to
reset all circuits
to
an
operational starting point.
PTX: Phototransistor.
RDDR:
Read
data daserializer register.
RDR:
Read
data register.
read
only
storage:
A storage whose contents are not
changed by computer instructions.
record: A group
of
related data items.
ROS:
Read
only storage.
RRA: Remove, replace, adjust.
SA:
Status byte
A.
SAR: Storage address register.
SB: Status byte
B.
scroll:
Move data on the display screen up or down;
SDR: Storage data register.
spindle:
A mechanical device
in
the tape unit
for
transferring motion
from
the jackshaft pulleys
to
th~
cartridge capstan.
steps:
An offset that occurs in a reel
of
tape when
exposed
to
extreme temperature drops.
supervisor: That part
of
the control program that
coordinates the
use
of
resources and maintains the
flow
of
processor operations.
sync:
Synchronize or synchronous.
syntax:
Structural rules
of
a programming language.
truncate:
To stop
an
operation at a specified point.
TS: Test status.
TSR: Transistor switching regulator.
TTL: Transistor-transistor logic.
TV
monitor:
An external display assembly that displays
the same information
as
the 5100
5-inch
display screen.
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