Glossary Of Terms And Abbreviations - IBM 5280 Maintenance Information Manual

ps: Microsecond.
Ilcm: Microseconds per centimeter.
A: Both the logic block symbol for the AND function and
the abbreviation for ampere.
AC: Alternating current.
access lines: The pulses on these lines turn the stepper
motor.
AM: Address mark.
amplifier: An electronic circuit that increases the
amplitude of a signal for distribution.
AR: Amplifier.
AR-DIF: See differentiator-amplifier.
bail assembly: (See 330
Em).
A mechanical arm that'
operates under control of the head load solenoid to load
or unload the read/write heads.
block: A collection of records recorded as a unit.
blocking: Combining two or more records into one block.
carriage: (See 330
Em).
The part that carries the
read/write heads under control of the stepper motor.
CE: Customer engineer.
characteristics: Electrical, physical, or functional features
of a machine which are not specifications.
clamp: A part used to lock another part.
collet: (See 330
II).
The part that centers and holds
the diskette to the drive hub.
CRC: Cyclic redundancy check.
, /
crosstalk: Data bits detected from one track while reading
from another track.
DC: Direct current.
Glossary of Terms and Abbreviations
DET: See detector.
detector: An electronic circuit that detects a carried
signal and converts it to a signal pulse.
differentiator-amplifier: An electronic circuit whose
output is a function of the time rate of change in the
input signal.
diskette 1: A diskette used for storing data on only one
side.
diskette
2:
A diskette used for storing data on both sides.
diskette 20: A diskette used for storing data on both
sides with twice the bit density of the diskette
2.
DR: See driver.
drive band: (See 341
1m).
A metal band connected to
the stepper motor pulley and the head/carriage assembly.
driver: An electronic circuit that increases the energy of
a signal to a sufficient level to drive a predetermined load.
flux: The flow of magnetic force around an object when
that object has been magnetized or has electric current
flowing through it.
FM: Frequency modulation. (See modulation.)
FRU: Field replaceable unit. A part or an assembly that
can be replaced by aCE.
HCP: (See 333
II).
Head connector pin.
hex: Hexadecimal.
10: Identification.
inverter: An electronic circuit that inverts a signal
(+
to -,
or - to
+).
I/O CP: (See 333
fJ).
Input/output connector pin.
Glossary 79