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OTHER SYSTEM FUNCTIONS
ENTRY PARAMETERS:
EXIT CONDITIONS:
27,4
~-
Diskette File Functions
x
=
The
add~ess
oT
the DFT.
The
OFT
must
contain
parameters:
the
Tollobling
LUN
must contain the logical unit number
on
which
~ne
file
resides
(ASCII
number 0-3,
$30-$33>'
RIB
must
contain
the
physical
secto-r
number
of
the
file's
RIB
if
the
directorf,J
entry
has
already
been
c'reated
(additional
space
allocation).
Oth erwi se,
RIB
must
that
no
Retrieval Information Block
exists for the
rile
(initial
space
allocation).
FDF
should
have
the
lie"
bit
set
to
indicate
whether
space
is
to
be
allocated contiguously to the already
existing space (RIB
not
ze~o).
If
the
.
"C"
bit
is
set
to
zero,
additional
space
can
be
allocated
anywhere
on the diskette.
If RIB is
zero,
th e FDF
entry
is
no
t
req,u ire
d'.
SIZ must contain the
number
of
sectors
that
are to be allocated.
If SIZ is
zero,
the de-Pault allocation size
(32
clusters> will be used.
SBS
must contain the starting address o-P
a
128
(decimal) byte sector buffer.
SEE must contain the
ending
address
of
the
sector
buffer.
If
the sector
buffer is
·larger
than
one
sector,
only
the
first
128
b~tes
will be
used.
A is indeterminate.
13
contains the r-etur-'n status.
The '!'"et
1
.J'!'!1
statuses
are
taken
from the set of
codes
defined
for
the
device
independent
IIO
functions.
Only the
system symbols
are
given
here
Tor
those
.return
statuses.··
The
exact
values can be
found. from
the
MOOS
equate
file,
section
25.3.1.
11
or
sec
t
ion 28. 3.
The
f
0
1 1
0 til
i
n 9
ret
liT'
n
statuses
are
defined:
Page
27-26
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