IBM: TPEBK

Programming Interface Information: This information is NOT intended to be
used as Programming Interfaces of VM/ESA. It is to be used for diagnosis only.

TPEBK

Prolog

Control Block Contents

TPEBK DSECT

Storage Layout

Cross Reference (Contains links to field and bit definitions)

TPEBK Prolog

 NAME       : HCPTPEBK
 DESCRIPTION: TAPE CONTROL BLOCK
 DSECT      : TPEBK
 FUNCTION   : THE TAPE CONTROL BLOCK IS USED TO SAVE INFORMATION
              USED FOR WRITING TO TAPE.
 LOCATED BY : SYSTPEBK IN HCPSYSCM
 CREATED BY : HCPTPEIN - DURING INITIALIZATION OF I/O PROCESSING.
 DELETED BY : HCPTPEND - DURING TERMINATION OF I/O PROCESSING.

TPEBK Control Block Content


TPEBK DSECT
Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      TPEBK          TAPE CONTROL BLOCK
0000    0 Dbl-Word     8 TPEUSER        USERID TO SEND INFORMATIONAL
                                        MESSAGES TO
0008    8 Signed       4 TPERDEV1       ADDRESS OF RDEVBK
000C   12 Signed       4 TPERDEV2       ADDRESS OF RDEVBK
0010   16 Bitstring    1 TPESTATS       TAPE STATUS
          1... ....      TPELABEL       X'80' WRITE TAPE LABEL
          .1.. ....      TPECANCL       X'40' CANCEL PROCESSING
0011   17 Bitstring    1 TPEDISP        TAPE DISPOSTION
          00000002       TPEREW         X'02' REWIND TAPE
          00000001       TPERUN         X'01' REWIND AND UNLOAD TAPE
0012   18 Bitstring    1 TPEMODE        TAPE MODE
          00000007       TPECOMP        X'07' MODE = NON-DEVICE SPECIFIC
                                        COMPACTION
          00000006       TPE3490C       X'06' MODE = 3490 COMPACTION
          00000005       TPEXF          X'05' MODE = XF
          00000004       TPE38K         X'04' MODE = 38K
          00000003       TPE6250        X'03' MODE = 6250 BPI
          00000002       TPE1600        X'02' MODE = 1600 BPI
          00000001       TPE800         X'01' MODE = 800 BPI
0013   19 Bitstring    1 *              RESERVED FOR IBM USE
0014   20 Signed       4 TPETPLBK       ADDRESS OF TAPE LABEL BLOCK
                                        HCPTPLBK
0018   24 Signed       4 TPERDEV        ADDRESS OF RDEV CURRENTLY DOING
                                        I/O TO
001C   28 Signed       4 TPEDATA        ADDRESS OF PARAMETER LIST
                                        CONTAINING NUMBER OF DATA BUFFERS
                                        TO BE WRITTEN TO TAPE, AND UP TO
                                        3 ADDRESSES O1FDATA BUFFERS
0020   32 Signed       4 TPEIORB1       ADDRESS OF IORBK
0024   36 Signed       4 TPEIORB2       ADDRESS OF IORBK
0028   40 Signed       4 TPEIORBK       ADDRESS OF CURRENT IORBK IN USE
002C   44 Signed       4 *              RESERVED FOR IBM USE
          00000006       TPESIZE        (*-TPEBK+7)/8 SIZE OF TPEBK IN
                                        DOUBLEWORDS

TPEBK Storage Layout

*** TPEBK - TAPE CONTROL BLOCK
*
*     +-------------------------------------------------------+
*   0 |                       TPEUSER                         |
*     +---------------------------+---------------------------+
*   8 |         TPERDEV1          |         TPERDEV2          |
*     +------+------+------+------+---------------------------+
*  10 |:STATS|:DISP |:MODE |//////|         TPETPLBK          |
*     +------+------+------+------+---------------------------+
*  18 |         TPERDEV           |         TPEDATA           |
*     +---------------------------+---------------------------+
*  20 |         TPEIORB1          |         TPEIORB2          |
*     +---------------------------+---------------------------+
*  28 |         TPEIORBK          |///////////////////////////|
*     +---------------------------+---------------------------+
*  30
*
*** TPEBK - TAPE CONTROL BLOCK