FeB - File Control Block, a small piece of memory used to control
the status
and
1/0
of data between the operating system and
disk files.
filename
- The mandatory name used to reference a disk file. A
filename consists of one
to
eight alphanumeric characters, the
first of which must
be
alphabetic.
filespec
- A disk file's name. A filespec consists of four fields and
two switches. The first field is always mandatory. A filespec is
in
the following format:
!fi
lenamel
ext.
password:drive!
"!" - (preceding filename)
is
an
optional switch.
If
you specify
this switch, you can build a file with the same name as a
TRSDOS command or utility. For example, you can issue the
command: LIST !DEVICE
and
TRSDOS will list the user-created
file named DEVICE.
filename - The mandatory name of the file.
lext - The optional file extension.
.password - The optional file password.
:drive - The optional drive number.
"!" - (following
:d)
is
an
optional switch.
If
this switch is set, the
end of file marker for filespec
is
updated after every write to the
file.
filter - A machine language program that monitors andlor alters
1/0
that passes through
it.
FILTER
is
also the library command that
establishes a FILTER routine.
IFIX
- The desired file extension for a PATCH file.
foreground
task
- Jobs performed
by
the computer that are
apparent
to
the user, such
as
running
an
applications program.
gran
- The abbreviation of granule. A gran is the minimum amount
of storage used for a disk file.
As
files are extended, file
allocation
is
increased
in
increments of grans. The size of a gran
varies with the size and density of a diskette.
HIGH$
- The name of a memory location
in
the operating system
that contains the address of the highest unprotected memory
address available for use. Programs that are above this location
are protected from other programs.
You
can display or change
the value of HIGH$
by
using the MEMORY command or the
@HIGH$ SVC.
interrupt
- A signal generated
by
the hardware which causes the
system to stop what it is doing to perform some other service.
These interruptions are used
to
perform background tasks such
A-a7
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