DEVICE
DEPENDENT
PARAMETERS:
DEVD=code
specifies
the
device
on
which
the
data
set
may
reside
as
one
of
the
following
codes.
The
codes
are
listed
in
order
of
descending
space
requirements
for
the
data
control
block:
Code
DA
TA
PT
PR
PC
RD
Device
Direct-access
Magnetic
tape
Paper
tape
Printer
Card
punch
Card
reader
~ote:
If
you
do
not
wish
to
select
a
specific
device
until
job
set
up
1:ime,
you
should
specify
the
device
type
requiring
the
largest
area.
The
following
diagrams
illustrate
the
device
dependent
portion
of
the
data
control
block
for
each
devi.ce
type
specified
in
the
DEVD
pararoeter,
and
for
each
data
set
organization
specified
in
the
DSORG
parameter.
Fields
that
correspond
to
device
dependent
parameters
in
addition
to
DEVD
are
indicated
by
the
para~eter
name.
For
special
services,
you
may
have
to
maintain
the
fields
shown
in
parentheses.
The
special
services
are
explained
in
the
note
that
follows
the
diagram.
Device
dependent
portion
of
data
control
block
when
DEVD=DA
and
DSORG=PS
or
po:
DCB
r-------T---------------------,
Address
+ 4
IReservdl
I
~
_______
J I
I I
+ 8 I
(FDAD
-
MBBCCHHR)
I
I I
I
r---------------------~
+12
I I
Reserved
I
~-------+-------T-------------~
+16
I
KEYLEN
I
ReservQ
I (TRBAl) I
L
_______
~
_______
~
_____________
J
Note:
For
cutput
data
sets,
the
system
uses
the
contents
of
the
full
disk
address
(FDAD-MBBCCHHR)
field
plus
one
to
write
a
file
mark
when
the
data
control
block
is
closed,
provided
the
track
balance
lTRBAL)
field
indicates
that
space
is
availatle.
You
must
maintain
the
contents
of
these
two
fields
yourself
if
the
system
is
to
write
a
file
mark.
Device
dependent
portion
of
data
control
block
when
DEVD=DA
and
DSORG=IS
or
DA:
DCB
r-------T---------------------,
Address
+16
IKEYLEN
I
Reserved
I
L
_______
L
_____________________
J
Device
dependent
portion
of
data
control
block
when
DEVD=TA
and
DSORG=PS:
DCB
r-----------------------------,
Address
+12
I (BLKCT) I
~------T-------T-------T------~
+16
ITRTCH
IReservdlDEN
IResrvdl
L
______
~
_______
~
_______
~
______
J
88
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