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ACK: Line control character for positive acknowledgment.
AS: Area Station; AS is also the mnemonic for the macro
that defines the Area Station for the System/360 assembler
program.
ASLIST: Mnemonic for the Area Station list macro instruc
tion.
bps: Bits per second.
Broadcast: To send data to all stations on the loop.
BSC: Binary Synchronous Communications.
BTAM: Basic Telecommunications Access Method.
Bundespost: The German government-operated common
carrier.
Byte: Eight data bits plus one parity bit.
CE: Channel End status bit. CE is also used as an abbrevia
tion for Customer Engineer when used in connection with
the CE/Operator Panel.
CONFIGUR: Mnemonic for a System/360 assembler macro
instruction.
CPU: Central processing unit.
CSW: System/360 channel status word.
Data Entry: A single block of data entered at the Area
Station or Data Entry Unit using a single data-entry device.
For the 2796, a data entry contains the Monitor key
identification, four rotary-switch settings, thumbwheel-
switch settings, and card or badge reading.
For the 2795, a data entry contains the two rotary-
switch settings and the badge or card reading.
For the 2791, a data entry contains the Monitor key
identification; Transaction Selection switch setting; and
data from the card reader, badge reader, or numeric key
board.
DE: Device End status bit.
DEU: Data Entry Unit.
DEULIST: Mnemonic for a System/360 assembler macro
instruction.
DLE: Binary-synchronous line-control character, Data
Link Escape.
DOS: Disk Operating System/360.
EBCDIC: Extended Binary Coded Decimal Interchange
Code.
ENQ: Line-control character, "enquiry."
EOC: End of card.
EREP: Environment Record Edit and Print
ERP: Error Recovery Procedure
ETB: Line-control character, "end of transmission block."
ETX: Line-control character, "end of text."
Explicit Text: Text from a source external to the 2715.
GPO: General Post Office, the government-operated com
mon carrier in Great Britain.
Guidance Character: An eight-bit data byte transmitted
from the system controller to the Area Station to indicate
the Operator Guidance light to be lighted, the device to be
read, and the state of the In-Process light.
Hexadecimal: A base 16 notation used in the System/360.
Hz: hertz (same as the former expression, cycles per
second).
ICPL: Initial Control Program Load.
Implicit Text: User-defined message stored in 2715 core
storage.
I/O: Input/Output.
Loop: Transmission lines connecting the Area Stations and
the system controller.
Macro: A statement used to define a number of program
steps.
MCA: Multiplexer Channel Adapter.
Message: One or more transactions sent as one " transmis
sion" between the system control unit and the CPU, Area
Station, or 2740.
Microcode: The internal coding that controls the 2715
hardware.
MPX: Multiplexer.
NAK: Line-control character, " negative acknowledgment."
NL: New-line character.
NTT: Nippon Telephone and Telegraph, the name of the
government-operated common carrier in Japan.
OS: Operating System/360.
Glossary
Glossary
71
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