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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.
Appendix
0
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.
Glossary
D·1
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