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OTHER SYSTEM FUNCTIONS
ENTRY
PARAMETERS:
EXIT CONDITIONS:
27.4 -- Diskette File Functions
B
=
A function code
that
specifies
the
action to be taken by . CHANG.
I' bit
o
is set to one, .
CHANG
will
change
the
rile name and suffix fields of a
directory entry.
If bit 1 is set
to
one,
the
function
will
change the
attribute field of a directory entry"
Bits
2-7
are not used and should be
zero.
Bits 0 and 1
are
independent
of
each
other.
Thus,
. CHANG can be
used to change rile name,
suf-Fixi and
attributes at the same time.
x
=
The
address
aT a rile table packet.
The packet has the following format:
o
1
2
3
Address
or
old DFT
Add,..ess
of
new
DFT
The ..
old DFT
11
con t a
ins
the L UN
I
NAM
1
and
SUF
fields
or
an
existing
directory
entry
that
is
to
be
changed.
The
SBS
contains
the
starting add,..ess
Or
a
128
(decimal)
byte sector buffer;
SEE contains the
ending add,..ess
of
the sector
buffer.
If
the
sector
bu~fer
is
la,..ger than
one sec tor
I
on 1 y
the
f
i
l ' S
t
128
b
q
t e
s
wi 11 be used.
The IIne
t
,JI
DFT"
contains
the information that is to be
placed
into
the
directo~y
ent~y.
LUN in
both OFTs must
be
the
same
(ASCII
numb er
0-3,
$30-$33).
Th
e
new OFT
must contain
NAM,
SUF,
and/or
FDF
fields
as
indicated by the function
code
in
the
B
register.
.A
sector
buffer
is
not
required
by
the
new
OFT.
A is indeterminate.
B
contains
the
return
following
return
derined:
status.
statuses
The
are
.
. /
B
=
0 indicates that no
errors
occurred
.~)
(norma 1 return).
Page
27-18
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