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INPUT/OUTPUT FUNCTIONS
25.3 -- Device Independent 1/0 Functions
C
(~it
C) -- Contiguous allocation bit
The
"e"
bit only applies to diskette files.
If
this bit is set
to
one,
only
contiguous
diskette
space
can be allocated to the file.
All files whose
contents are to be loaded into memory
directly
from
the
diskette must be allocated contiguous space.
!r
the
ftC" bit is set
to zerOl
the -File
may
be allocated
segmented
diskette space.
The
"e"
bit is one of the
inhe~ent
attributes of a file.
It
is
specified
at
the
time
the
Tile is created and cannot be changed
thereafter.
N
(Bit B) -- Non-compressed space bit
The "Nil
bit only applies to diskette files.
If
this
bit is set to one, ASCII records
~ritten
to the
-File Ulill
not have spaces compressed.
IT
the
liNn
bit
is
set
to
zero,
ASCII
Tecords written to the Tile
Ulill have
spaces
compressed
into
a
byte
of
the
Tollo~ing
format:
7
·6
5
4
3
2
1
o
Number
Or
compressed
spaces
CompreSSion flag
(=1)
All
MDOS commands CTeate ASCII riles with space
compression (N
=
0) in
o~der
to minimize
the
amount
of
dis k e
t t
e
spa
c e
con
5
ume
d .
The" N
I:
bit
i
s
on e
0
f
the inherent
att~ibutes
o~
a file.
It
is
specified
at the time the file is
c~eated
and cannot be changed
thereafter.
The
space compression
att~ibute
is
only
meaningful
ir
the file format is ASCII record (FMT =
5).
For
other
ro~mats,
the
space.
compression
attribute is ignored.
FMT (Bits a-A) -- File format bits
The
rile
ro~mat
bits
de$c~ibe
the internal data
structure oT the file.
The file rormat is one of the
inherent
attributes
of a file.
FMT
is specified at
the time the file is created and
cannot
be
changed
thereafter.
The
following table lists the values of
FMT and their meanings:
. \
)
Page
25-28
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