HP 250 - Page 145

Glossary
defective tracks - a track on a storage medium where reading and
writing of data is not possible, usually because of a scratch,
dirt, or lack of magnetic oxide on the surface of the disc. If
any defective tracks exist, they are identified during the media
initialization process (the IN IT utility program).
disc - a storage medium for the HP 250.
display - a television-like screen used for outputting data, mes-
sages, and other information to the operator.
display editing keys - a set of keys used to position the cursor
at specific locations on the display to modify data
directory - a "table of contents" showing the name, type, and
number of files recorded on a disc.
disc drive - the device used to transfer data between disc media
and computer memory.
disc drive code - the number of the disc drive unit.
diagnostic - a test that the system performs on itself.
DROM - (Discrete Relocatable Optional Module), a system software
module which can be configured to be loaded into system memory at
power-on.
exponentiation - raising a number to a power. For example:
2**3 = 2*2*2 8
editing - correcting errors, whether typographical or
non-typographical, and modifying program lines and data.
error message - an English phrase or number describing an error
that has occurred during execution. An error number refers to a
detailed description of the problem (see the appendix titled
Error Messages).
expression - one or more variables, numbers, functions, etc.,
grouped together with operators (+,-,*,/, etc.), and mathematic-
ally or logically evaluated to a single value.
file - a file is one or more logical records written on a storage
medium. It consists of contiguous sectors which hold information
such as programs or user-defined data.
flexible disc - one of the storage media for the HP 250. Data is
written on a thin magnetic oxide film coated on plastic. The
disc is enclosed in a sealed plastic jacket for protection.
floppy disc - another name for a flexible disc.
A-2
Glossary
defective tracks - a track on a storage medium where reading and
writing of data is not possible, usually because of a scratch,
dirt, or lack of magnetic oxide on the surface of the disc. If
any defective tracks exist, they are identified during the media
initialization process (the IN IT utility program).
disc - a storage medium for the HP 250.
display - a television-like screen used for outputting data, mes-
sages, and other information to the operator.
display editing keys - a set of keys used to position the cursor
at specific locations on the display to modify data
directory - a "table of contents" showing the name, type, and
number of files recorded on a disc.
disc drive - the device used to transfer data between disc media
and computer memory.
disc drive code - the number of the disc drive unit.
diagnostic - a test that the system performs on itself.
DROM - (Discrete Relocatable Optional Module), a system software
module which can be configured to be loaded into system memory at
power-on.
exponentiation - raising a number to a power. For example:
2**3 = 2*2*2 8
editing - correcting errors, whether typographical or
non-typographical, and modifying program lines and data.
error message - an English phrase or number describing an error
that has occurred during execution. An error number refers to a
detailed description of the problem (see the appendix titled
Error Messages).
expression - one or more variables, numbers, functions, etc.,
grouped together with operators (+,-,*,/, etc.), and mathematic-
ally or logically evaluated to a single value.
file - a file is one or more logical records written on a storage
medium. It consists of contiguous sectors which hold information
such as programs or user-defined data.
flexible disc - one of the storage media for the HP 250. Data is
written on a thin magnetic oxide film coated on plastic. The
disc is enclosed in a sealed plastic jacket for protection.
floppy disc - another name for a flexible disc.
A-2