Abbreviations And Glossary - IBM 2671 Manual

Abbreviations and Glossary
ABBREVIATIONS
ac Alternating Current
BCD Binary Coded Decimal
CE Customer Engineer (IBM)
dc Direct Current
EBCDIC Extended Binary-Coded-Decimal Interchange Code
EOF End of File
EOR End of Record
EOT End of Tape
I/O Input/Output
NPRO Nonprocess Runout
USASCII United States of America Code for Information Interchange
GLOSSARY
Blank Character:
WMSMMSWMSi:.
O o
sM'ii
O
O
• •
c
• i l l !
Ill;
- Feed Holes
Chad:
Blank Tape:
T
11
Hi
SIS
Channel Contention: The channel is busy with another I/O unit at a
time when the 2671/2822 requires to transmit data.
Check: A fault or a stop condition.
Degate: To close the gates at the standard I/O channel interface to
data traffic.
Delete Character: All tracks punched (whether 5, 6, 7, or 8 in
number); made during punching by adding the necessary additional
holes to a wrongly-punched character.
EOR Character: A specific paper tape code that means that the end
of a record is reached.
Null Character: Same as Blank Character,
Nonprocess Runout (NPRO): The feeding of tape through the 2671
without the tape being read (for example, as in rewinding).
Byte:
Data
Register
Output
'
^
8 Bits + Parity Bit
Overstep: The condition caused by the tape not stopping with a
character over the read head.
Track Suppression: The reading of holes punched in a particular
track is ignored by the 2671/2822, and the track output is held to
zero.
Tape Creep: The condition caused by the tape moving gradually
when it should be stationary.
Abbreviations and Glossary 49