| Appendage vector
table section of the DEB pointed to by DEBAPPAD |
| 0(0) |
|
20 |
DEBAVT(0) |
Appendage vector table |
| 0(0) |
ADDRESS |
4 |
DEBEOEA(0) |
Address of end-of-extent appendage routine |
| 0(0) |
BITSTRING |
1 |
DEBEOEAB |
Flag byte |
| |
. . . . xxxx |
|
DEBEOENP |
X'0F'– number of 2K pages to be fixed
for the end–of–extent appendage |
| 1(1) |
ADDRESS |
3 |
DEBEOEAD |
Address of end-of-extent appendage routine |
| 4(4) |
ADDRESS |
4 |
DEBSIOA(0) |
Address of start I/O appendage routine |
| 4(4) |
BITSTRING |
1 |
DEBSIOAB |
Flag byte |
| |
1. . . . . . . |
|
DEBPGFX |
X'80' Address in DEBSIOAD can be used
to determine the entry point to the page fix (PGFX) appendage routine
by adding 4 to the address in DEBSIOAD |
| |
.1. . . . . . |
|
DEBSIOX |
X'40'– if zero, do not enter SIO appendage
when ERP IS active. If one, enter SIO appendage even when ERP is active. |
| |
. .1. . . . . |
|
DEBIOVR |
X'20'– If one, EXCPVR request is valid.
If zero, EXCPVR request is invalid and will not be executed. Currently
has no effect. |
| |
. . .1 . . . . |
|
DEBFIX |
X'10' Indication that DEB has been fixed |
| |
. . . . xxxx |
|
DEBSIONP |
X'0F'– number of 2K pages to be fixed
for the SIO appendage |
| 5(5) |
ADDRESS |
3 |
DEBSIOAD |
Address of start I/O appendage routine |
| 8(8) |
ADDRESS |
4 |
DEBPCIA(0) |
Address of PCI appendage routine |
| 8(8) |
BITSTRING |
1 |
DEBPCIAB |
Flag byte |
| |
. . . . xxxx |
|
DEBPCINP |
X'0F'–number of 2K pages to be fixed
for the PCI appendage |
| 9(9) |
ADDRESS |
3 |
DEBPCIAD |
Address of program controlled interruption (PCI)
appendage routine |
| 12(C) |
ADDRESS |
4 |
DEBCEA(0) |
Address of channel end appendage routine |
| 12(C) |
BITSTRING |
1 |
DEBCEAB |
Flag byte |
| |
1. . . . . . . |
|
DEBESMVR |
X'80',c'x' validity check for EXCPVR
caller |
| |
. . . . xxxx |
|
DEBCENP |
X'0F'– number of 2K pages to be fixed
for the channel–end appendage |
| 13(D) |
ADDRESS |
3 |
DEBCEAD |
Address of channel end appendage routine |
| 16(10) |
ADDRESS |
4 |
DEBXCEA(0) |
Address of abnormal end appendage routine |
| 16(10) |
BITSTRING |
1 |
DEBXCEAB |
Flag byte |
| |
. . . . xxxx |
|
DEBXCENP |
X'0F'– number of 2K pages to be fixed
for the abnormal–end appendage |
| 17(11) |
ADDRESS |
3 |
DEBXCEAD |
Address of abnormal end appendage routine |
| |
X'' |
|
DEBAVTE |
"*" End of appendage vector table |
| DEB PREFIX TABLE.
Addressable as negative offset from DEB basic section. Not necessarily
contiguous with DEB appendage vector table. |
| -16(10) |
|
16 |
DEBPREFX(0) |
DEB prefix table |
| -16(10) |
BITSTRING |
1 |
DEBWKARA |
O/C/E work area (direct access) |
| -15(F) |
BITSTRING |
7 |
DEBDSCBA |
DSCB address (BBCCHHR) used by O/C/E (direct access) |
| -8(8) |
ADDRESS |
4 |
DEBXTNP(0) |
Pointer to DEB extension |
| -4(4) |
BITSTRING |
1 |
DEBLNGTH |
Length of DEB in double words. If it exceeds
2040 bytes (X'FF' doublewords), the excess bits are ignored. |
| -3(3) |
CHARACTER |
1 |
DEBAMTYP |
Access method type |
| |
X'0' |
|
DEBAMNON |
"0" Access method type not known |
| |
X'1' |
|
DEBAMVSM |
"1" VSAM access method type |
| |
X'2' |
|
DEBAMXCP |
"2" EXCP access method type |
| |
X'4' |
|
|
Reserved |
| |
X'8' |
|
DEBAMGAM |
"8" Graphics access method type |
| |
X'10' |
|
DEBAMTAM |
"16" BTAM access method type |
| |
X'20' |
|
DEBAMBPM |
"32" BPAM access method type |
| |
X'20' |
|
DEBAMSAM |
"32" Sequential access method type |
| |
X'40' |
|
DEBAMBDM |
"64" Direct access method type |
| |
X'81' |
|
DEBAMSUB |
"129" subsystem access method type |
| |
X'82' |
|
DEBAMVTM |
"130" VTAM® access method type |
| |
X'84' |
|
|
Reserved |
| -2(2) |
UNSIGNED |
2 |
DEBTBLOF |
For system use |
| |
X'24' |
|
DEBPREFE |
"*" End of DEB prefix table |
| DEB basic section |
| 0(0) |
|
|
DEBBASIC |
"*" |
| 0(0) |
ADDRESS |
4 |
DEBTCBAD(0) |
Address of TCB for this DEB |
| 0(0) |
BITSTRING |
1 |
DEBNMSUB |
Number of subroutines loaded by OPEN executor
routines and identified in the subroutine name section (DEBSUBID) |
| 1(1) |
ADDRESS |
3 |
DEBTCBB |
Address of TCB for this DEB |
| 4(4) |
ADDRESS |
4 |
DEBDEBAD(0) |
Address of the next DEB in the same task |
| 4(4) |
BITSTRING |
1 |
DEBAMLNG |
Number of bytes in the access method dependent
section. For BDAM this field contains the length expressed in number
of words. |
| 5(5) |
ADDRESS |
3 |
DEBDEBB |
Address of the next DEB in the same task |
| 8(8) |
ADDRESS |
4 |
DEBIRBAD(0) |
IRB storage address used for appendage asynchronous
exits |
| 8(8) |
BITSTRING |
1 |
DEBOFLGS |
Data set status flags |
| |
xx. . . . . . |
|
DEBDISP |
X'C0'– data set disposition flags bit
setting disposition |
| |
01. . . . . . |
|
DEBDSOLD |
X'40' old data set |
| |
10 . . . . . . |
|
DEBDSMOD |
X'80' mod data set |
| |
11. . . . . . |
|
DEBDSNEW |
X'C0' new data set |
| |
. .1. . . . . |
|
DEBEOF |
X'20'– end of file (EOF) encountered
(tape input) format 1 DSCB bit 93.0 indicates that the current volume
is the last volume of the data set (DASD input) |
| |
. . .1 . . . . |
|
DEBRLSE |
X'10'– release unused external storage
(DASD) emulator tape with second generation format. Tape might contain
blocks shorter than 12 characters. (tape) |
| |
. . . . .1. . |
|
DEBSPLIT |
X'04'–7–track emulator tape with possible
mixed parity records (tape) |
| |
. . . . . .1. |
|
DEBLABEL |
X'02'– nonstandard labels |
| |
. . . . . . .1 |
|
DEBRERR |
X'01'– use reduced error recovery procedure
(tape) concatenated partitioned organization data sets processed using
BPAM (DASD) |
| 9(9) |
ADDRESS |
3 |
DEBIRBB |
IRB storage address used for appendage asynchronous
exits |
| 12(C) |
BITSTRING |
1 |
DEBOPATB |
Flags indicating both the method of I/O processing
and the disposition that is to be performed when an end of volume
(EOV) condition occurs |
| |
1. . . . . . . |
|
DEBABEND |
X'80'– set by abend indicating a sysabend
or sysudump data set |
| |
.1. . . . . . |
|
DEBZERO |
X'40'– always zero |
| |
. .xx . . . . |
|
DEBPOSIT |
X'30'– data set positioning flags bit
setting positioning |
| |
. . 01 . . . . |
|
DEBRERED |
X'10' reread |
| |
. .11 . . . . |
|
DEBLEAVE |
X'30' leave |
| |
. . . . xxxx |
|
DEBACCS |
X'0F'– type of I/O accessing being done
bit setting accessing |
| |
. . . . 0000 |
|
DEBINPUT |
X'0' INPUT |
| |
. . . . 1111 |
|
DEBOUTPT |
X'F' OUTPUT or EXTEND |
| |
. . . . 0011 |
|
DEBINOUT |
X'3' INOUT |
| |
. . . . 0111 |
|
DEBOUTIN |
X'7' OUTIN or OUTINX |
| |
. . . . 0001 |
|
DEBRDBCK |
X'1' RDBACK |
| |
. . . . 0100 |
|
DEBUPDAT |
X'4' UPDAT |
| 13(D) |
BITSTRING |
1 |
DEBQSCNT |
PURGE (SVC 16) – Quiesce count. Number of devices
executing user's channel programs, as shown by bits 5 and 6 of UCBFL1
fields. |
| 14(E) |
BITSTRING |
1 |
DEBFLGS1 |
Flag field |
| |
1. . . . . . . |
|
DEBPWCKD |
X'80'– password was supplied during OPEN.
EOV will not request a password for each additional volume of a multivolume
data set. |
| |
.1. . . . . . |
|
DEBEOFDF |
X'40'– set by EOV to inform close that
an end of file has been encountered and, therefore, deferred user
label processing is allowed. |
| |
. . .1 . . . . |
|
DEBEXCPA |
X'10'– EXCP(VR) is authorized for this
DEB |
| |
. . . . .1. . |
|
DEBF1CEV |
X'04'–not valid with an EXCP DCB. |
| |
. . . . . .1. |
|
DEBAPFIN |
X'02'– if on, authorized programs can
be loaded |
| |
. . . . . . .1 |
|
DEBXTNIN |
X'01'– if one, DEB extension exists |
| 15(F) |
BITSTRING |
1 |
DEBFLGS2 |
Flag field two |
| |
|
|
|
The following two flag bits are used by O/C/EOV
to maintain a uniform recording mode (compaction or non-compaction)
on tape data sets that span over more than one volume. |
| |
. . . . 1. . . |
|
DEBDSCMP |
X'08' tape data set compaction mode |
| |
. . . . .1. . |
|
DEBDSNCP |
X'04' tape data set non-compaction mode |
| |
. . . . . . 1. |
|
DEB31UCB |
UCB address fields are four bytes. Use DEBSUCBA,
DEBUCBAD, DEBSDVMX or DEBDVMOD31 instead of DEBSUCBB, DEBUCBA, DEBSDVM
or DEBDVMOD. |
| 16(10) |
ADDRESS |
4 |
DEBUSRPG(0) |
Address of purged I/O restore list (PIRL) |
| 16(10) |
BITSTRING |
1 |
DEBNMEXT |
Number of extent descriptions starting at DEBBASND.
One extent per unit for extended format or PDSE data sets. |
| 17(11) |
ADDRESS |
3 |
DEBUSRPB |
Address of purged I/O restore list (PIRL) |
| 20(14) |
ADDRESS |
4 |
DEBRRQ(0) |
Pointer to related request queue |
| 20(14) |
BITSTRING |
1 |
DEBPRIOR |
Priority of the task owning DEB |
| 24(18) |
ADDRESS |
4 |
DEBDCBAD(0) |
Address of DCB or ACB associated with this DEB |
| 24(18) |
BITSTRING |
1 |
DEBPROTG(0) |
Task protection key in high order 4 bits |
| 24(18) |
BITSTRING |
1 |
DEBDEBID |
A hex F in low–order 4 bits to identify this block
as a DEB |
| 25(19) |
ADDRESS |
3 |
DEBDCBB |
Address of DCB or ACB associated with this DEB |
| 28(1C) |
ADDRESS |
4 |
DEBAPPAD(0) |
Address of the I/O appendage vector table |
| 28(1C) |
ADDRESS |
1 |
DEBEXSCL |
This field is used to determine the size of the
device dependent section. Two to this power gives the length of the
device dependent section at DEBBASND. Extent scale – 4 (16 bytes)
for direct access device and 3525 card punch with device–associated
data set support and 2 (4 bytes) for nondirect access device and communication
device. |
| 29(1D) |
ADDRESS |
3 |
DEBAPPB |
Address of the I/O appendage vector table |
| 32(20) |
|
|
DEBBASND |
End of basic section |
| Unit Record, Magnetic
Tape, Telecommunications Devices Section |
| 32(20) |
|
|
DEBDDS1 |
"*" |
| 32(20) |
ADDRESS |
4 |
DEBSUCBA(0) |
See the
DEBUCBAD field. |
| 32(20) |
BITSTRING |
1 |
DEBSDVM |
Device modifier. For magnetic tape,
MODESET operation code. For unit record, not defined. Valid only
if DEB31UCB is off. |
| |
1101 0011 |
|
DEBMTDN4 |
X'D3' 9–track MODESET CCW CODE DENSITY=6250BPI |
| |
1100 0011 |
|
DEBMTDN3 |
X'C3' 9–track MODESET CCW CODE DENSITY=1600BPI |
| |
1100 1011 |
|
DEBMTDN2 |
X'CB' 9–track MODESET CCW CODE DENSITY=
800BPI 7–track TAPE MODESET skeleton codes (must be completed with
parity, translation and/or conversion) |
| |
0000 0011 |
|
DEBM7DN0 |
X'03' 7–track MODESET SKELETON DENSITY=200BPI |
| |
0100 0011 |
|
DEBM7DN1 |
X'43' 7–track MODESET SKELETON DENSITY=556BPI |
| |
1000 0011 |
|
DEBM7DN2 |
X'83' 7–track MODESET SKELETON DENSITY=800BPI
3480 tape operation code |
| |
1100 0011 |
|
DEBMSTWI |
X'C3' 3480 set tape write immediate ccw
code. Tape mode set function byte |
| |
1. . . . . . . |
|
DEBMTRF0 |
X'80' tape recording format bit 0 |
| |
.1. . . . . . |
|
DEBMTRF1 |
X'40' tape recording format bit 1 |
| |
. .1. . . . . |
|
DEBMTWI |
X'20' tape write immediate (non-buffered
write) |
| |
. . .1 . . . . |
|
DEBMINHS |
X'10' inhibit supervisor commands |
| |
. . . . 1. . . |
|
DEBMCOMP |
X'08' compacted recording mode |
| |
. . . . 1. . . |
|
DEBCMPAC |
"DEBMCOMP" COMPACTED RECORDING MODE |
| |
. . . . . .1. |
|
DEBM3424 |
X'02' 3424 mode set flag |
| |
. . . . . . .1 |
|
DEBMINHE |
X'01' inhibit control unit ERP |
| |
X'C2' |
|
DEBM6250 |
"DEBMTRF0+ DEBMTRF1+ DEBM3424"SET 3424 DENSITY=6250BPI |
| |
X'42' |
|
DEBM1600 |
"DEBMTRF1+ DEBM3424" SET 3424 DENSITY=1600BPI |
| 33(21) |
ADDRESS |
3 |
DEBSUCBB |
Address of a UCB associated with a given data
set |
| 36(24) |
|
0 |
DEBDEVED(0) |
End of common tape and unit record fields if DEB31UCB
is off. |
| Next four bytes present
only if DEB31UCB is on |
| 36(24) |
BITS |
1 |
DEBSDVMX |
Device modifier. For magnetic tape, modeset operation
code or modeset function byte. For unit record reserved. Present only
if DEB31UCB is on. |
| 37(25) |
CHARACTER |
3 |
|
Reserved |
| 40(28) |
|
0 |
DEBDVEDX |
End of section if DEB31UCB is on. |
| The following fields
are present only for the 3525 with device–associated data set support |
| 36(24) |
ADDRESS |
4 |
DEBRDCB(0) |
|
| 36(24) |
BITSTRING |
1 |
DEBRSV06 |
|
| 37(25) |
ADDRESS |
3 |
DEBRDCBA |
|
| 40(28) |
ADDRESS |
4 |
DEBPDCB(0) |
|
| 40(28) |
BITSTRING |
1 |
DEBRSV07 |
|
| 41(29) |
ADDRESS |
3 |
DEBPDCBA |
|
| 44(2C) |
ADDRESS |
4 |
DEBWDCB(0) |
|
| 44(2C) |
BITSTRING |
1 |
DEBRSV08 |
|
| 45(2D) |
ADDRESS |
3 |
DEBWDCBA |
|
| |
|
|
DEBASDSE |
Address of DCB for the read associated data set |
| Direct–access storage
device section it follows the basic section. There is one of these
sections for each extent, except for a pdse or extended format data
set, in which case there is one section per device. |
| 0(0) |
ADDRESS |
4 |
DEBUCBAD |
Address of a UCB associated with this extent.
The following applies to DEBSUCBA, DEBSUCBB, DEBUCBAD and DEBUCBA:
If the actual UCB is above the 16 MB line and the dynamic allocation
nocapture option is not in effect, allocation normally captures the
UCB to create a 24-bit address. When using EXCP
and you specify the nocapture option of dynamic allocation but not
the LOC=ANY option on the DCBE, then OPEN or EOV captures the UCB
until a later EOV or close. In these cases the high order byte of
this word contains the device modifier byte. If you specify nocapture
on the dynamic allocation and the actual DASD or tape UCB address
is above the line and the DCB is for BSAM, BPAM, QSAM or EXCP and
the DCBE has specified LOC=ANY, then the system does not capture
the UCB. In that case OPEN turns on the DEB31UCB bit to signify the
31-bit UCB address field is valid and that the device modifier byte
is in DEBSDVMX or DEBDVMOD31. It may remain on for subsequent volumes
even though they have actual 24-bit addresses in a four-byte field. |
| 0(0) |
BITSTRING |
1 |
DEBDVMOD |
Device modifier. File mask. Valid only if
DEB31UCB is off. |
| 1(1) |
ADDRESS |
3 |
DEBUCBA |
Address of UCB for this extent. Valid only
if DEB31UCB is off. |
| 4(4) |
BINARY |
1 |
DEBDVMOD31 |
Reserved if DEB31UCB is off. File mask (device
modifier) if DEB31UCB is on. |
| 5(5) |
BINARY |
1 |
DEBNMTRKHI |
High order byte of number
of tracks in extent. Low order two bytes are in DEBNMTRK. DEBNMTRKHI
combined with DEBNMTRK gives total number of tracks in this extent.
DEBNMTRKHI is 0 for a basic format data set and may be non-zero for
a large format data set. |
| 6(6) |
BINARY |
2 |
DEBSTRCC |
Low order 16 bits of cylinder number of start
of extent |
| 8(8) |
BINARY |
2 |
DEBSTRHH |
High order 12 bits of cylinder number and
four-bit track number of start of extent |
| 10(A) |
BINARY |
2 |
DEBENDCC |
Low order 16 bits of cylinder number of end
of extent. Not set for a PDSE |
| 12(C) |
BINARY |
2 |
DEBENDHH |
High order 12 bits
of cylinder number and four-bit track number of end of extent. For
PDSE this field is reserved. For an extended format data set this
field contains the track number of the format-1 dscb address. |
| 14(E) |
BINARY |
2 |
DEBNMTRK |
Number of tracks allocated to a given extent.
For a pdse this field is set to one(X'0001'). For an extended
format sequential data set the first byte contains the record number
of the format-1 dscb address, and the second byte is zero. |
| |
|
|
DEBDASDE |
"*" end of DASD device section |
| EXCP Access Method,
Bsam And Qsam Dependent Section Length Is In DEBAMLNG. |
| 0(0) |
BINARY |
2 |
DEBVOLSQ |
Volume sequence number for multivolume sequential
data sets |
| 0(0) |
BITSTRING |
1 |
DEBVOLBT |
First byte of debvolsq. Reserved for system use. |
| 1(1) |
SIGNED |
1 |
DEBVLSEQ |
For direct access, sequence number of the volume
of the data set relative to the first volume of the data set. For
tape, sequence number of the volume of the data set relative to the
first volume processed. |
| 2(2) |
BINARY |
2 |
DEBVOLNM |
Total number of volumes in a multivolume sequential
data set. |
| 4(4) |
BINARY |
8 |
DEBDSNM |
Member name. This field appears only when an output
data set has been opened for a member name and the dscb specifies
a partitioned data set. |
| 4(4) |
ADDRESS |
4 |
DEBUTSAA |
Address of the user totaling save area |
| 4(4) |
BITSTRING |
1 |
DEBRSV13 |
For system use |
| 5(5) |
ADDRESS |
3 |
DEBUTSAB |
Address of the user totaling save area |
| 8(8) |
BITSTRING |
4 |
DEBRSV14 |
For system use (if user totaling was specified) |
| 12(C) |
SIGNED |
2 |
DEBBLKSI |
Maximum block size |
| 14(E) |
SIGNED |
2 |
DEBLRECL |
Logical record length |
| BPAM Dependent Section |
| 0(0) |
BINARY |
1 |
DEBEXTNM |
For a partitioned data set opened for input, each
one–byte field contains the extent number of the first extent entry
for each data set except the first, if two or more data sets are concatenated.
The number of bytes in the field is equal to one less than the number
of data sets concatenated. |
| 0(0) |
CHARACTER |
8 |
DEBDSNAM |
For a partitioned data set opened for output for
a member name, this field is the member name. |
| BDAM Dependent Section
For Fixed Length Records With The Option Of Relative Block Addressing |
| 0(0) |
BINARY |
4 |
DEBDBLK |
One four byte field for each extent described
in the device dependent section |
| 0(0) |
ADDRESS |
1 |
DEBDBPT |
Number of blocks per track |
| 1(1) |
BINARY |
3 |
DEBDBPE |
Number of blocks per extent |
| Subroutine Name Section
Note Follows The Access Method Dependent Section, Or The Device Dependent
Section If There Is No Access Method Section |
| 0(0) |
CHARACTER |
2 |
DEBSUBID |
Subroutine identification. Each access method
subroutine, appendage subroutine, and irb routine will have a unique
eight–byte name. The low–order two bytes of each routine name will
be in this field if the subroutine is loaded by the OPEN routines.
|
| DEB Extension Pointed
To By DEBXTNP In The DEB Prefix |
| 0(0) |
SIGNED |
2 |
DEBXLNGH |
Length of DEB extension |
| 2(2) |
BITSTRING |
1 |
DEBXFLG1 |
Flag byte—for system use |
| 3(3) |
BITSTRING |
1 |
DEBXFLG2 |
Flag byte |
| |
.1. . . . . . |
|
DEBBYP |
X'40'– when on EXCP scan routine will
set iosbyp on and bypass building a prefix |
| |
. .1. . . . . |
|
DEBCHCMP |
X'20'– when on EXCP scan routine will
set ioschcmp on and bypass building a prefix |
| 4(4) |
ADDRESS |
4 |
DEBXDSAB |
Pointer to dsab |
| 8(8) |
BITSTRING |
4 |
|
For system use |
| 12(C) |
ADDRESS |
4 |
DEBXDBPR |
Pointer to DEB |
| 16(10) |
CHARACTER |
24 |
|
For system use |
| 40(28) |
BITSTRING |
8 |
DEBXDEF(0) |
Define extent data area |
| 40(28) |
BITSTRING |
1 |
DEBDEFG1 |
Flag byte |
| |
1. . . . . . . |
|
DEBNSHED |
X'80' no seek head permitted |
| |
.1. . . . . . |
|
DEBXVDEF |
X'40' DEB def ext data parms valid.
Must be on for dx data to be used. |
| 41(29) |
BITSTRING |
1 |
DEBGATTR |
Global attributes |
| |
xx. . . . . . |
|
DEBECKD |
X'C0' extent definition 2 b'00......'
define extent operates as defined for fixed block arch b'11......'
define extent operates as defined for ckd ext-cchh extents |
| |
1. . . . . . . |
|
DEBGAEX1 |
X'80' extent definition 1 |
| |
.1. . . . . . |
|
DEBGAEX2 |
X'40' extent definition 2 |
| |
. .1. . . . . |
|
DEBSTRTP |
X'20' data storage type-norm/temp b'..1.....'
normal data storage b'..0.....' temporary data storage |
| |
. . .x xx . . |
|
DEBGA345 |
X'1c' attributes bits 3,4,5 b'...000..'
normal cache access b'...001..' bypass cache load b'...010..' inhibit
cache load b'...011..' sequential access b'...100..' reserved b'...101..'
reserved b'...111..' reserved b'......xx' reserved |
| |
. . .1 . . . . |
|
DEBGA1 |
X'10' attribute 1 |
| |
. . . . 1 . . . |
|
DEBGA2 |
X'08' attribute 2 |
| |
. . . . .1 . . |
|
DEBGA3 |
X'04' attribute 3 b'...000..' normal
cache access b'...001..' bypass cache load b'...010..' inhibit cache
load b'...011..' sequential access b'...100..' sequential staging
mode'...101..' record access mode b'...111..' reserved b'......xx'
reserved |
| |
. . . 0 00 . . |
|
DEBNCACH |
X'00' normal cache access |
| |
. . . 0 01 . . |
|
DEBBCACH |
X'04' bypass cache load |
| |
. . . 0 10 . . |
|
DEBICACH |
X'08' inhibit cache load |
| |
. . . 0 11 . . |
|
DEBSCACH |
X'0c' sequential access |
| |
. . . . . .1. |
|
DEBNRD |
X'02' non-retentive data access |
| |
. . . . . . .1 |
|
DEBINHFW |
X'01' inhibit fast write b'......10'
use non-retentive data b'......11' inhibit DASD fast write |
| 42(2A) |
BITSTRING |
2 |
DEBBLKSZ |
Blocksize in bytes if less than or equal to 32760 |
| 44(2C) |
CHARACTER |
4 |
DEBEXTOK |
Zero,extent locator or token |
| 44(2C) |
CHARACTER |
2 |
DEBNRDID |
Subsystem function id: non-retentive data id or
concurrent copy / xrc session id |
| 46(2E) |
CHARACTER |
2 |
|
|
| 48(30) |
CHARACTER |
4 |
DEBIOPID |
For system use |
| 52(34) |
CHARACTER |
4 |
DEBBLKID |
Block id value used to calculate number of blocks
in this tape volume for extended block count checking |
z/OS DFSMSdfp Advanced Services
Copyright IBM Corporation 1990, 2014