TOPS-10 Monitor Calls Manual Volume 2 AA-K039D ... - Trailing-Edge

GLOSSARY
Internal date-time format
The format for storing a combined date and time internally. This
format is used by SCAN and other programs. It has thE~ property
that it is one 35-bit ("integer") quantity such that the
difference between two points in time in internal format is
constant if they are a constant time apart. The format is:
In the left halfword, the number of days since November 17, 1858.
In the right half a fraction of the day s~nce
midnight.
This results in a resolution of approximately one third of a
second. The date field will not be exceeded until 2217 A.D.
(November 17, 1858, is the origin date used by the Smithsonian
calendar. This calendar is in use by several computer systems
and many astrophysics programs. Its origin was selected because
November 18, 1858 was the date of the first "Harvard Plates,"
which were the first accurate astronomical photographs. Hence,
this date standard minimizes the date field while leaving all
astrophysical measurements as positive dates) .
Internal storage
Addressable high speed storage directly controlled by the central
processing unit.
Internal symbol
Interrupt
IPCF
A global symbol located in the module in which it is defined. In
a MACRO-10 program, a symbol is declared internal with t:he INTERN
or ENTRY pseudo-ope These pseudo-ops generate a global
definition which is used to satisfy all global requests for the
symbol.
A signal which, when activated, causes a transfer of control to a
specific location in memory thereby breaking the normal flow of
control of the routine being executed. An interrupt is caused by
an external event such as a done condition in a peripheral. It
is distinguished from a trap which is caused by the execution of
a processor instruction.
The Inter-Process Communications Facility,
communication among jobs and system processes.
JACCT program
which
allows
Jiffy
A program running with the JACCT privilege bit. This is set by
the monitor for special system programs such as LOGIN. This bit
gives the caller full file access; that is, it allows the caller
to LOOKUP and read any file in the system regardless of the
file's protection code.
A period of time equal to 1/60 of a second (for 60 Hz power) or
1/50 of a second (for 50 Hz power), used to count CPU cycles.
Synonym for "tick."
Gloss-18