System Control Blocks

Offset
+3
+4
+12
+15
+0
Bytes and Field
Alignment Name
• • . 1
8
3
• . . 1
TIOELINK
• 1 ..
· .1.
· .. 1 1 •.•
x ••• .xxx
1 ...
• xxx xxxx
TIOEDDNM
TIOEJFCB
TIOESTTC
1 •••
• 1 ••
• .1.
• .• 1 1 •••
. 1 ••
• • 1.
••• 1
TASK INPUT/OUTPUT TABLE
Field Description, Contents, Meaning
DD Entry (Continued)
During allocation:
Link to the appropriate prime split. unit affinity,
volume affinity or suballocate TIOT entry.
After allocation:
TIOTOPEN- TSO: Data set is open •
TIOTTERM- TSO: Device is a terminal.
TIOEDYNM- TSO: DYNAM coded on DD statement.
TIOEQNAM- TCAM: QNAME coded on DD statement.
(Reserved bits)
After CLOSE:
This is a SYSOUT data set that contains data.
(Reserved tits)
DO name.
Relative track address (TTR) of the JFCB. (During
allocation, TTR of ,the SlOT if suballocate was
requested.)
Status Byte C. Used during allocation only. Set to
zeros at end of allocation.
Secondary suballocate.
Deferred mount •
primary unit affinity.
Secondary unit affinity.
Primary volume affinity.
Secondary volume affinity •
primary suballocate •
Secondary suballocate •
DEVICE ENTRIES
During allocation: 1 device entry for each device required, or for each
public device eligible.
During problem program: 1 device entry for each allocated device.
1 TIOESTTB status byte B -
During allocation and during problem program:
1 ••• Data set is on device.
. 1 •. Data set will use device •
.• 1. Device violates separation •
•.. 1 Volume serial present •
1 .•. Setup message required.
.x •• Disposition:
.1 .. Retain unloaded volume if unload required.
.0 •• Delete unloaded volume if unload required.
•• 1. Unload required •
•.. 1 Verification required •
344 OS System Control Blocks (Release 21.7)