System Control Blocks

Offset
40 (28) 2
40 (28)
41 (29)
42 (2A) •• 2
44 (2C) 2
46 (2E) •• 2
48 (30) 1
49 (31) • 1
Bytes and Field
Alignment Name
50 (32) •• 2
50 (32) •• 1
51 (33) 1
52 (34) 4
56 (38) 8
64 (40) 1
65 (41) • 3
68 (44) 1
69 (45) • 3
LCBERRST
Byte 1
1 ..•
. 1 ..
•• 1.
· .. 1 x •• x
. 1 •.
. . 1.
Byte 2
1 •••
. 1 ..
• .1.
• •• 1 1 ••.
• xxx
LCBBRKCT
LCBTTIND
LCBLPl'R
LCBFLAG1,
IOBFLAGl
LCBFLAG2,
lOB FLAG 2
xxxx xxx.
• • • x
••. 1
LCBSENSE,
IOBSENSO
lOBS ENS 1
LCBECBPT,
IOBECBPT
LCBC5W,
IOBCSW
LCBSIOCC,
IOBSIOCC
LCBSTARl',
IODSTART
LCBDCBPl',
IOBDCBPT
LINE CONTROL BLOCK
Hex.
Dig. Field Description, Contents, Meaning
Communications line error.
Invalid destination code.
Terminal inoperative •
Sequence number high •
Sequence number low.
(Reserved bits)
Incomplete header •
Invalid source code •
Transmission error •
Time-out exceeded.
Breakoff error.
Insufficient buffers.
Message not sent.
(Reserved bits)
If receiving, the last status of SEQ IN (terminal
table).
If not receiving, the time of the requested
interruption.
Address of terminal table entry for current message.
Address of next entry in distribution list.
INPUT/OUTPUT BLOCK .FORMAT
status bits used by the I/O supervisor.
Flag bits.
Status bits used by the I/O supervisor.
Flag bit used by QTAM •
Line is to be polled using the autopoll feature •
Sense information stored by the I/O supervisor.
First byte of sense information.
Second byte of sense information.
Not used by QTAM.
Channel status word.
start I/O condition code.
Address of the first ccw executed in the channel
program.
Reserved.
Address of the DCB.
LeB 245