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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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