MPE/iX Glossary of Terms and Acronyms (32650-90887)

18 Chapter1
Glossary of Terms
data type and size.
command A system-reserved word that directs the operating system, a subsystem, or
a utility program to perform a specific operation.
command file 1. A set of one or more MPE/iX commands in a file that are executed by
specifying the file name. See also HPPATH or UDC.
2. A set of one or more SQL or ISQL commands in a file that can be
executed with the ISQL START command.
command interpreter (CI) CI: A program that reads command lines entered at the
standard input device, interprets them, determines if they are valid, and,
if so, executes them.
command line history stack See history stack (also called command history stack).
command set '80 protocol (CS/80 or CS-80) A family of mass storage devices from
Hewlett-Packard that communicate using the C/80 protocol. Examples are
the HP 7911, HP 7912, HP 7914 disk/tape drives.
communication The ability of one computer system to access or talk to other computer
systems by way of telecommunication devices.
communication link The software and hardware that moves data from the driver and
card of one computer to the driver of an adjacent computer.
communications subsystem capability (CS) Allows users to obtain exclusive access to
a communications device such as a DSN/RJE line or a DSN/DS line. The
capability is required to use DSN/RJE subsystems.
compatibility The ability of software developed for one computer to work on another
computer. See compatibility mode.
compatibility mode (CM) Compatibility mode provides object code compatibility
between MPE V/E-based systems and the 900 Series HP 3000.
Compatibility mode allows current Hewlett-Packard customers to move
applications and data to the 900 Series HP 3000 without changes or
recompilation.
compile The process of changing a program written in a source language (for
example, BASIC, C, FORTRAN) into machine executable instructions. The
compiled routine is then ready to be link-edited and then loaded into
storage and run.
compiler A program that translates source code written by a programmer into
machine instructions. The compiler also diagnoses and reports syntax
errors found in the application program.
completion list A linked list of four-word entries made by a direct memory access (DMA)
I/O card before interrupting the processor. Each DMA adapter or module
(which may have more than one DMA device associated with it) has its
own completion list.
complex instruction set computer (CISC) A computer based on an architecture that
uses microprogramming and complex instructions.
component name A name identifying an object within the context of a directory object.