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OTHER SYSTEM FUNCTIONS
27.4 -- Diskette File Functions -
B
=
1
indicates
that
B
contained
an
invalid function code upon
entr~
to
. CHANG.
B
=
3
indicates
that
the directory entry
specified
b~
LUN, NAM, and SUF of the
old
DFT
could
not
be round in the
director~.
The
old
DFT
directory
entry
must
exist
in
order Tor the
change to be possible.
B
=
4
indicates that the directory
entry
specified by LUN, NAM, and SUF of the
new
DFT
already
existed
in
the
directory.
The
new
DFT
director~
entry must have
a
unique
file
name
and
suffix (only if changing the old
en tr
y
I
S
IT
i
1
e
name).
B
=
5
indicates that an invalid attribute
change
was
attempted.
Only
the
changeable attributes
(system
file,
write
protection,
delete protection)
can
be
changed.
The
inherent
attributes
of a
file remain constant
for
the
duration
Or
the
file's
ex
i
stenc e.
X
is unchanged.
C
=
0
if
no erroT'S occurred
(B
=
0),
The
remainder of
CC
is
ind~terminate.
C = 1
if an error
occurred (B not
zero).
The remainder of
CC
is indeterminate.
The four-byte file packet is unchanged.
The
old
DFT
and its sector buffer have
been
changed
as
a
result
of
perro~ming
a
diT'ecto~y
search (.
DIRSM
with B
=
2).
The
new
DFT
has
been
changed
as
a result of
perro~ming
a
directory search
<'DIRSM
with
B
=
4);
however,
no diskette space allocation
UJa s peT'
for me
d .
A f i 1 e n a m e c han 9 e
i s
affected
by
deleting
the
old
directory entry and by creating a new
directory entry.
Thus, the directory
entry's DEN (and its position
within
the
directory)
may
have
changed;
however,
no
space
is
deleted
or
reallocated.
Page
27-19
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