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online: 1. Pertaining to equipment or devices under control of the central processing
unit. 2. Pertaining to a user's ability to interact with a computer.
online
test
executive program (OL TEP): The control program of the online test
system. OL TEP is the interfaoe between the online test and the operating system.
on-line test system: A control program, OLTEP, and a series of tests (OL Ts) designed
to test I/O devices while permitting normal system processing in the foreground par-
titions.
operand: 1. • That which is operated upon. An operand is usually identified by an
address part of an instruction. 2. I nformation entered with a command name to define
the data on which the command processor operates and to control the execution of
the command processor.
operator command: A statement to the control program, issued via a console device,
which causes the control program
to
provide requested information, alter normal
operations, initiate new operations, or terminate existing operations.
output
queue:
A queue of control information describing system output data sets, that
specifies to an output writer the location and disposition of system output.
output writer: A part of the job schaduler that writes output data sets onto a system
output unit, independently of the program that produced such data sets .
• overflow: 1. That portion of the result of an operation that exceeds the capacity of
the intended unit of storage. 2. Pertaining to the generation of overflow as in 11).
p
page: 1. A fixed-length block of instructions, data or both, that can be transferred
between real storage and external page storage. 2. To transfer instructions, data, or
both, between real storage and external
page
storage.
page dB1a
set:
An extent in auxiliary storage, in which pages are stored.
PII!JII
fault:
A program interruption that occurs when a
page
that is marked "not in
real storage" is referred to by an active
page.
Synonymous with page translation
exoeption.
page frame: A 2K block of real storage that can contain a
page.
page
frame table: A table that contains an entry for each frame. Each frame entry des-
cribes how the frame is being used.
page pool: The set of all page frames that may contain pages of programs in virtual
mode.
page tabte (PGT):
A
table
that
indicates whetMer
!::I
pagr:'
i~
in
real S'tor8:gt:'
~nd
t:or.
relates virtual addresses with real storage addresses.
page translation exception: A program interruption that occurs when a virtual address
cannot be translated by the hardware because the invalid bit in the page table entry
for that address is set. See also segment translation exception, translation specification
exception.
paging The process of transferring pages between real storage and the page data set.
parallel processing: Concurrent execution of one or more programs.
• pa-ameter: A variable that is given a constant value for a specific purpose or
process.
partition: 1. In OSIVS1, a division of the dynamic area of virtual storage, established
at system generation. 2. In DOSIVS, a division of the virtual address area of virtual
storage that is allocated for programs that may be paged.
Page 7·8
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