Glossary - IBM 5100 Maintenance Information Manual

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Glossary
adapter: A hardware device that connects two channels
on the same computing system or on different systems.
address label: One or more characters used to identify
an address in a computer program.
alphameric keys: That part of the keyboard that
resembles a typewriter keyboard.
ALU: Arithmetic logic unit.
APL: A programming language.
ATTN: Attention.
BASIC: Beginners ali-purpose symbolic instruction
code.
BCD: Binary coded decimal.
bits per second: Communication line transmission rate.
BOT: Beginning of tape.
bps: Bits per second.
BUP: Bring up program.
CC1: Character count 1.
CMD: Command key.
control unit: That portion of the A 1 board in the 5100
that contains the controlier, portions of the base I/O
card, and all storage. The control unit contains
microinstructions and the logic necessary to execute
them.
controller: The microinstruction processor within the
5100 Portable Computer.
cps: Characters per second.
CRC: Cyclic redundancy check.
CRT: Cathode ray tube.
cyclic redundancy check: An error check. Counting of
the bits on a record.
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DA: Device address.
DCP1: Diagnostic control program 1.
DCP2: Diagnostic control program 2.
EC: Error code.
EOT: End of tape.
executable ROS: Contains microinstructions that can
be executed directly by the controlier.
flags: A character or bit that signals a condition to a
program, such as an I/O error. A record on the format
track that provides positioning and timing information
for records on the data track.
flyplate: The pad on the bottom of a keyboard key
module. When a key is pressed, the flyplate raises and
the capacitive change indicates to the keyboard printed
circuit that the key is pressed.
FRU: Field replaceable unit.
header record: A record containing identifying
information pertaining to a group of records that follow.
hex: Hexadecimal.
I/O: Input/output.
I/O interface port: A removable panel located on the
back of the 5100 that contains the signal and power
connectors for attaching I/O devices.
IAR: Instruction address register.
IMF: Internal machine fix.
interpreter: A computer program stored in ROS that
controls execution of BASIC and APL instructions.
interval timer: Measures the time between clock pulses
coming from the read head.
10CB: Input/output control block.
IR: Incident report;
ITPS code: Internal teleprocessing system code.
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