Programming Interface Information: This information is NOT intended to be used as Programming Interfaces of z/VM.

#### RDCBK

Prolog

Control Block Contents
RDCBK DSECT

Storage Layout

Cross Reference (Contains links to field and bit definitions)

#### RDCBK Prolog

     NAME       : HCPRDCBK
     DESCRIPTION: Real Device Characteristics Block
     DSECT      : RDCBK
     FUNCTION   : The Real Device Characteristics Block contains
                  DEVICE/CONTROL UNIT information.  This data is
                  divided into two parts:
                  - static device information.
                  - 64 bytes of information returned from a
                  RDC (Read Device Characteristics) CCW.
     LOCATED BY : RDEVRDCA Field of the RDEV.
                  SYSRDCA  Field of the SYSCM
                  - Address of the first RDCBK entry
     CREATED BY : RDCBK'S are dynamic and in part are created by the
                  device specific initialization modules.
                  RDCBK'S also acquire their data from a Read Device
                  Characteristic CCW during device initialization.
     DELETED BY : RDCBK'S are created at Initialization or the
                  Vary Online command and are never deleted.
     SERIALIZED : RDEV Lock
     COMMENTS   : When using this block for FBA DASD, the
                  first 8 bytes should not be included
                  since the RDC CCW doesn't return this
                  information.  Therefore to use this
                  DSECT when issuing the RDC CCW, the data
                  returned must be placed starting at
                  RDCFBARE.
                  Notes      : Field RDCFBARE is defined
                  starting at location RDCOPER (RDCFEAT+2).

#### RDCBK Control Block Content

#### RDCBK DSECT

    Hex   Dec Type/Val   Lng Label (dup)    Comments
    ---- ---- --------- ---- -------------- --------
    0000    0 Structure      RDCBK          Real Device Characteristics Block
                 The first 64 bytes contain the architected RDC info.
    0000    0 Bitstring   64 RDCDATA (0)    RDC 64 BYTES RETURNED
    0000    0 Bitstring    2 RDCCUID        CONTROL UNIT IDENTIFIER
    0002    2 Bitstring    1 RDCCUMN        CONTROL UNIT MODEL
    0003    3 Bitstring    2 RDCDVID        DEVICE IDENTIFIER (= Device TYPE)
    0005    5 Bitstring    1 RDCDVMN        DEVICE MODEL
    0006    6 Bitstring    4 RDCFEAT (0)    Device and storage control
    0006    6 Bitstring    2 *              Device and stg control bytes 0-1
    0008    8 Bitstring    1 RDCEXFC        Extended Function Capacity
              ..1. ....      RDCPPRC        X'20' Device Support PPRC CCWs
    0009    9 Bitstring    1 RDCFEAT3       Device and stg control byte 3
              .1.. ....      RDCMPLF        X'40' Device is attached to a
                                            control unit which supports MPLF
              ..1. ....      RDCRCACH       X'20' Device is attached to a
                                            control unit which supports
                                            record cache facilities.
    000A   10 Bitstring    2 RDCOSCOD (0)   OS DEVICE CODES
    000A   10 Bitstring    1 RDCOSCLS       OS DEVICE CLASS CODE
    000B   11 Bitstring    1 RDCOSTYP       OS DEVICE TYPE CODE
    000C   12 Bitstring   28 RDCDEVF1       DEVICE SPECIFIC FIELD 1
    0028   40 Bitstring    1 RDCMDRID       MDR IDENTIFIER
    0029   41 Bitstring    1 RDCOBRID       OBR IDENTIFIER
    002A   42 Bitstring   22 RDCDEVF2       DEVICE SPECIFIC FIELD 2
              00000040       RDCDALEN       (*-RDCDATA) LENGTH OF RDC DATA
                                            RETURNED
                 Static device information
    0040   64 Address      4 RDCNEXT        ADDR OF NEXT RDCBK IN CHAIN
    0044   68 Character    4 RDCDCHAR       Device ID in EBCDIC.
    0048   72 Bitstring    1 RDCFLGS (0)    DEVICE STATUS FLAG
    0048   72 Bitstring    1 RDCSTATS       DEVICE RDC STATUS
              1... ....      RDCSUPT        X'80' DEVICE SUPPORTS RDC CCW
              .1.. ....      RDCNCRNT       X'40' RDCBK IS NOT CURRENT FOR
                                            DEVICE
              ..1. ....      RDCOFFSP       X'20' ERP should be done for this
                                            ... device when it is offline.
              ...1 ....      RDCFBA         X'10' RDCBK is for an FBA DASD
              .... ...1      RDCSSUPT       X'01' DEVICE SHOULD SUPPORT RDC
                                            CCW
    0049   73 Bitstring    1 RDCCUFT        Control unit features flag
              1... ....      RDCCASS        X'80' Device is attached to a
                                            caching control unit.
              .1.. ....      RDCSICS        X'40' Device is attached to a
                                            control unit which supports
                                            special intercept condition.
              ..1. ....      RDCNOSR        X'20' Device is attached to a
                                            control unit which does not
                                            support suspend/resume
              ...1 ....      RDCASYNC       X'10' Device is attached to a
                                            control unit which supports
                                            asynchronous processing.
              .... 1...      RDCRSTNT       X'08' Device is attached to a
                                            control unit which supports reset
                                            notification processing.
              .... .1..      RDCCUIBK       X'04' Device is attached to a
                                            control unit which is described
                                            by a CUIBK
              .... ..1.      RDCFLASH       X'02' Device supports FLASHCOPY
                                            VM/XA INTERNAL DEVICE TYPE CODES
    004A   74 Bitstring    1 RDCDVCLS       VM/XA DEVICE CLASS CODE
    004B   75 Bitstring    1 RDCDVTYP       VM/XA DEVICE TYPE CODE
    004C   76 Bitstring    1 RDCDVFTR       VM/XA DEVICE FEATURE CODE
                                            Additional Initialization
                                            Verification Fields
    004D   77 Bitstring    1 RDCRDMN        USER DEFINED DEVICE MODEL NUMBER
    004E   78 Bitstring    1 RDCRC          Invalid I/O configuration id.
    004F   79 Bitstring    1 RDCDVSCL       VM/ESA device subclass code CP
                                            SYSTEM SERVICES AREA
    0050   80 Address      4 RDCERPA        ERROR RECOVERY PROCEDURE ADDRESS
    0054   84 Address      4 RDCERSA        ERROR RECOVERY SPECIFIC ADDRESS
    0058   88 Address      4 RDCCRSA        CHANNEL ERROR RECOVERY SPEC. ADDR
    005C   92 Address      4 RDCCPTA        CHANNEL PROGRAM TABLE ADDRESS
    0060   96 Address      4 RDCCMTBA       DEVICE MANAGEMENT COMMAND TABLE @
    0064  100 Address      4 RDCLERPA       LIMITED ERROR RECOVERY PROC ADDR
    0068  104 Address      4 RDCLERSA       LIMITED ERROR RECOVERY SPEC ADDR
    006C  108 Address      4 RDCSQUY        SENSE DATA QUERY ROUTINE ADDR
    0070  112 Signed       4 *              Reserved for IBM use
    0074  116 Signed       4 *              Reserved for IBM use
                 Device Specific Area
    0078  120 Bitstring   80 RDCDSPEC       Device specific area
              000000C8       RDCLEN         (*-RDCBK) LENGTH OF THE RDCBK IN
                                            BYTES
              00000019       RDCSIZE        (*-RDCBK+7)/8 LENGTH OF THE RDCBK
                                            IN DOUBLEWORDS
                 The area below is for DASD redefinitons:
    0078  120 Bitstring    2 RDCTCYL        DASD - TOTAL NUMBER OF CYLINDERS
    007A  122 Bitstring    2 RDCPCYL        DASD - NUMBER OF PAGES/CYLINDER
    007C  124 Signed       2 RDCDEVLM       DASD (CP-owned only) Number of
                                            slots to be allocated before
                                            switching to another DASD.
    007E  126 Signed       2 RDCMAXPR       DASD (CP-owned only) Theoretical
                                            paging rate based on average SEEK
                                            time divided into 1 second
                                            multipled by 10.
    0080  128 Signed       2 RDCMASK        DASD (CP-owned only) Used as a
                                            mask for slot allocation of
                                            records on cylinder and head
                                            zero. It is a mask for the total
                                            number of records that are not
                                            used for that track.
    0082  130 Bitstring    1 RDCPPTRK       DASD - Number of pages/track 4K
    0083  131 Bitstring    1 RDCTPGEX       DASD (CP-owned only) Count of
                                            DASD paging exposures.
              00000001       RDCSNGEX       1 DASD (CP-owned only) Code used
                                            to determine if the DASD is a
                                            single exposure device.
    0084  132 Bitstring    1 RDCPAGFG       DASD (CP-owned only) Paging flags
                                            to indicate more characteristics
                                            about the DASD.
              .... ...1      RDCCPOWN       X'01' DASD (CP-owned only)
                                            Indicates that this DASD is fully
                                            supported by CP.
              .... ..1.      RDCMINID       X'02' DASD (CP-owned only)
                                            Indicates that this DASD supports
                                            paging I/O for minidisk-pools.
              .... .1..      RDCPAGOY       X'04' DASD (CP-owned only) Used
                                            mainly for 3350 11/21 which
                                            indicates that paging only space
                                            is allowed for this volume.
    0085  133 Bitstring    1 RDCFLAG        DASD flags
              .... ..1.      RDCLRE         X'02' DASD This DASD/control unit
                                            combination supports the Locate
                                            Record Extended CCW
              .... ...1      RDCMDC         X'01' DASD This device type is
                                            supported by minidisk cache.
    0086  134 Bitstring    1 * (2)          Reserved for IBM use
    0088  136 Address      4 RDCCPVOL       DASD (CP-owned only) Address of
                                            the queue that this DASD would
                                            reside on if it is fully CP
                                            supported. The queue is located
                                            in HCPPGD.
    008C  140 Signed       4 RDCMLOAD       DASD (CP-owned only) Initial
                                            MLOAD for paging DASD based on
                                            average SEEK time divided by 16
                                            micro seconds.
    0090  144 Bitstring    1 RDCNPSEC (14)  DASD (CP-owned only) Sector
                                            numbers for a CP-owned or
                                            minidisk-pool DASD that is
                                            formatted with 4k records without
                                            pad records.
    009E  158 Bitstring    1 RDCSECTR (14)  DASD (CP-owned only) The sector
                                            numbers for a CP-owned DASD that
                                            was formatted with CPFORMAT. The
                                            tracks are formatted with pad
                                            records.
    00AC  172 Signed       4 RDCDPSBK       Address of DPSBK table. Contains
                                            the number of records per track
                                            of each standard or non-standard
                                            record size.
    00B0  176 Signed       4 RDCQRTIM       Max number of minutes to respond
                                            to a Quiesce/Resume request
    00B4  180 Bitstring   20 *              Reserved for IBM use
         *** Bytes defined for CKD/ECKD DASD RDC Features field
    0006    6 Bitstring    1 RDCVFAC        Program-visible facilities
              .... 1...      RDCSSCSP       X'08' Set System Characteristics
                                            is supported
              .... .1..      RDCSSCRC       X'04' Set System Characteristics
                                            has been received for this Path
                                            Group
              .... ..1.      RDCPRFX        X'02' Prefix CCW supported &
                                            enabled
    0007    7 Bitstring    1 RDCVFAC2       Program-visible facilities 2
              .1.. ....      RDCVPAVU       X'40' PAV is unsupported for this
                                            DASD, only valid if RDCSSCRC is
                                            set
    0008    8 Bitstring    1 *              Reserved for future IBM use
    0009    9 Bitstring    1 RDCSFEAT       SUBSYSTEM FEATURES SUPPORTED
              1... ....      RDCCFW         X'80' SUPPORTS NON-RETENTIVE DATA
                                            (CACHE FAST WRITE)
              .1.. ....      RDCCFLF        X'40' SUPPORTS LOCK FACILITY
                                            (CFLF) RPQ
              ..1. ....      RDCRCS         X'20' SUPPORTS RECORD CACHE RPQ
              .... 1...      RDCDUP         X'08' Supports Duplex Pairs
              .... .1..      RDCDFW         X'04' SUPPORTS DASD FAST WRITE
         *** Bytes defined for CKD/ECKD DASD RDC Field 1
    000C   12 Bitstring    2 RDCMCYL        NUMBER OF PRIMARY CYL
    000E   14 Bitstring    2 RDCTPCYL       NUMBER OF TRACKS PER CYLINDER
    0010   16 Bitstring    1 RDCSECT        NUMBER OF SECTORS
    0011   17 Bitstring    3 RDCTOTRK       TOTAL TRACK LENGTH USABLE
    0014   20 Bitstring    2 RDCHA          LENGTH OF HOME ADDR AND RECRD
                                            ZERO
    0016   22 Bitstring    1 RDCMODE        TRACK CAP CALCULATION FORMULA
                                            CODE
    0017   23 Bitstring    5 RDCMDFR        TRACK CAP CALCULATION FACTORS
    001C   28 Bitstring    2 RDCALTCL       ADDR OF FIRST ALTERNATE CYLINDER
    001E   30 Bitstring    2 RDCALTRX       NUMBER OF ALTERNATE TRACKS
    0020   32 Bitstring    2 RDCDIAG        ADDR OF FIRST DIAGNOSTIC CYLINDER
    0022   34 Bitstring    2 RDCDIAGN       NUMBER OF DIAGNOSTIC TRACKS
    0024   36 Bitstring    2 RDCDVCYL       ADDRESS OF FIRST DEVICE CYLINDER
    0026   38 Bitstring    2 RDCDVTRK       NUMBER OF DEVICE SUPPORT TRACKS
         *** Bytes defined for CKD/ECKD DASD RDC Field 2
    002A   42 Bitstring    1 RDCCUTYP       CONTROL UNIT TYPE CODE
    002B   43 Bitstring    1 RDCMRTPL       MAX READ TRACKSET PARAMETER
                                            LENGTH
    002C   44 Bitstring    2 RDCMXR0        MAXIMUM RECORD ZERO DATA LENGTH
    002E   46 Bitstring    1 RDC46          DASD SPECIFIC RESERVED
    002F   47 Bitstring    1 RDCTRSSZ       TRACK SET SIZE
    0030   48 Bitstring    1 RDCATCCF       ADDITIONAL TRACK CAPACITY
                                            CALCULATION FACTOR
    0031   49 Bitstring    2 RDC4950        DASD SPECIFIC RESERVED
    0033   51 Bitstring    1 RDCLTHRS       CONCOPY LOWER THRESHOLD
    0034   52 Bitstring    1 RDC52          DASD SPECIFIC RESERVED
    0035   53 Bitstring    1 RDCUTHRS       CONCOPY UPPER THRESHOLD
    0036   54 Bitstring    1 RDCDCUF        Device and control unit features
              .... .1..      RDCMIRR        X'04' Device is Mirroring capable
    0037   55 Bitstring    1 RDC55          DASD SPECIFIC RESERVED
    0038   56 Bitstring    1 RDCRCUC        REAL CU CODE
    0039   57 Bitstring    1 RDCOBRCO       OBR CODE
    003A   58 Bitstring    6 RDC5863        DASD SPECIFIC RESERVED
                 The area below is for FBA DASD:
         *** Bytes defined for FBA RDCFEAT field.
    0006    6 Bitstring    2 *              Reserved for IBM use.
    0008    8 Bitstring    1 RDCFBARE (0)   Start of FBA architected area
    0008    8 Bitstring    1 RDCOPER        Device operation modes
              .1.. ....      RDCOVRRN       X'40' Overrunnable device
              ..1. ....      RDCBURST       X'20' Burst mode device
              ...1 ....      RDCDATCH       X'10' Data chaining supported
    0009    9 Bitstring    1 RDCFBAFT       Features
              .1.. ....      RDCREMOV       X'40' Removable media feature
              ..1. ....      RDCRRLSE       X'20' Reserve/release feature
              .... 1...      RDCMOVAM       X'08' Movable access mechanism
              .... .1..      RDCFIXHM       X'04' Fixed head mechanism
         *** Bytes defined for FBA DASD RDC Field 1
    000C   12 Bitstring    2 RDCRECSZ       Physical record size
    000E   14 Bitstring    4 RDCBLKCG       Blocks per cyclical group (track)
    0012   18 Bitstring    4 RDCBLKAP       Blocks per access position (cyl)
    0016   22 Bitstring    4 RDCBLKMA       Blocks under movable access
    001A   26 Bitstring    4 RDCBLKFA       Blocks under fixed access
    001E   30 Bitstring    1 * (2)          Reserved for IBM use
    0020   32 Bitstring    2 RDCBLKCE       Blocks in CE area
    0022   34 Bitstring    1 * (6)          Reserved for IBM use
                 The area below is for tape drives:
         *** Bytes defined for TAPE RDCFEAT field.
    0006    6 Bitstring    2 *              Reserved for IBM use.
    0008    8 Bitstring    1 RDCFET3        RDC Data byte 8
              ...1 ....      RDCTRAM        X'10' Tape has Asyncronous Msg
                                            support
              .... 1...      RDCTCUIR       X'08' Tape supports CUIR (SIC)
              .... .1..      RDCCPNOP       X'04' Supports Channel Path NOP
                                            command
    0009    9 Bitstring    1 RDCFETFE       Features
              .1.. ....      RDCCMPCT       X'40' RDC DATA BYTE 9 COMPACTION
                                            IND.
              ...1 ....      RDCLIBON       X'10' Library Manager online
              .... 1...      RDCLAFIN       X'08' Library Attachment Ftr
                                            installed
         *** Bytes defined for TAPE RDC Field 1
    000C   12 Bitstring   28 RDCTAPE1 (0)   TAPE SPECIFIC RESERVED
    000C   12 Bitstring   20 *              Reserved
    0020   32 Bitstring    3 RDCLIBSQ       Library Sequence Number
    0023   35 Bitstring    1 RDCLIBID       Library Subsystem ID
    0024   36 Bitstring    4 *              Reserved
         *** Bytes defined for TAPE RDC Field 2
    002A   42 Bitstring   22 RDCTAPE2       TAPE SPECIFIC RESERVED
                 New Tape Product (NTP) redefinitions:
    0006    6 Bitstring    1 RDCFRMAT       RDC Format 6
              .... ....      RDCOLDT        X'00' Defines Tape RDC info
                                            before NTP
              .... ...1      RDCNTP         X'01' Defines NTP RDC information
    0007    7 Bitstring    3 RDCSSF1 (0)    Subsystem Facilities 1 7-9
    0007    7 Bitstring    1 *              No fields defined 7
    0008    8 Bitstring    1 *              Same as RDCFET3, above 8
    0009    9 Bitstring    1 *              Same as RDCFETFE, above 9
    000A   10 Bitstring    2 *              Reserved 10-11
    000C   12 Bitstring    4 RDCSSF2 (0)    Subsystem Facilities 2 12-15
    000C   12 Bitstring    1 RDCSSF20       SSF2, byte 0 12
    000D   13 Bitstring    1 RDCSSF21       SSF2, byte 1 13
              1... ....      RDCRDFWD       X'80' Device supports Read
                                            Forward CCW
              .... .1..      RDCMODST       X'04' DEVICE SUPPORTS MODE
                                            SET/SENSE CCW
    000E   14 Bitstring    1 RDCSSF22       SSF2, byte 2 14
              ..1. ....      RDCTSSCS       X'20' Tape Set System
                                            Characteristics is supported
              .... .1..      RDCMEDSC       X'04' Medium Sense and Chars
                                            supported
    000F   15 Bitstring    1 RDCSSF23       SSF2, byte 3 15
    0010   16 Bitstring    1 RDCDVTYM       Device Type-Model 16
    0011   17 Bitstring    2 RDCDVMPL       Device Manufacturer and 17-18
                                            Plant of Manufacture
    0013   19 Bitstring    3 RDCDVSEQ       Device Sequence Number 19-21
    0016   22 Bitstring    1 RDCCUTYM       Control Unit Type-Model 22
    0017   23 Bitstring    2 RDCCUMPL       Control Unit Manufacturer 23-24
                                            and Plant of Manufacture
    0019   25 Bitstring    3 RDCCUSEQ       Control Unit Sequence Number25-27
    001C   28 Bitstring    1 *              Reserved for IBM use 28
    001D   29 Bitstring    1 RDCLBTYM       Library Type-Model 29
    001E   30 Bitstring    1 *              Reserved for IBM use 30
    001F   31 Bitstring    1 RDCEPI         ERDS Physical Identifer 31
    0020   32 Bitstring    3 *              Same as RDCLIBSQ, above 32-34
    0023   35 Bitstring    1 *              Same as RDCLIBID, above 35
    0024   36 Bitstring    2 RDCVLLID       Volume Loader Identifier 36-37
    0026   38 Bitstring    1 RDCDEVID       Device Identifier 38
    0027   39 Bitstring    1 *              Reserved 39
    0028   40 Bitstring    1 *              Same as RDCMDRID, above 40
    0029   41 Bitstring    1 *              Same as RDCOBRID, above 41
    002A   42 Bitstring    1 RDCDVCOD       OS Device Code=Class=Type 42

#### RDCBK Storage Layout

    *** RDCBK - Real Device Characteristics Block
    *
    *     +-------------+------+-------------+------+-------------+
    *   0 |  RDCCUID    |:CUMN |  RDCDVID    |:DVMN |/////////////|
    *     +------+------+------+------+------+------+-------------+
    *   8 |:EXFC |:FEAT3|:OSCLS|:OSTYP|                           |
    *     +------+------+------+------+                           |
    *  10 |                                                       |
    *     =                       RDCDEVF1                        =
    *     |                                                       |
    *     +------+------+-----------------------------------------+
    *  28 |:MDRID|:OBRID|                                         |
    *     +------+------+                                         |
    *     |                       RDCDEVF2                        |
    *     |                                                       |
    *     +---------------------------+---------------------------+
    *  40 |         RDCNEXT           |         RDCDCHAR          |
    *     +------+------+------+------+------+------+------+------+
    *  48 |:STATS|:CUFT |:DVCLS|:DVTYP|:DVFTR|:RDMN |RDCRC |:DVSCL|
    *     +------+------+------+------+------+------+------+------+
    *  50 |         RDCERPA           |         RDCERSA           |
    *     +---------------------------+---------------------------+
    *  58 |         RDCCRSA           |         RDCCPTA           |
    *     +---------------------------+---------------------------+
    *  60 |         RDCCMTBA          |         RDCLERPA          |
    *     +---------------------------+---------------------------+
    *  68 |         RDCLERSA          |         RDCSQUY           |
    *     +---------------------------+---------------------------+
    *  70 |///////////////////////////|///////////////////////////|
    *     +---------------------------+---------------------------+
    *  78 |                                                       |
    *     =                       RDCDSPEC                        =
    *     |                                                       |
    *     +-------------------------------------------------------+
    *  C8
    *
    *** RDCBK - Real Device Characteristics Block

    *** Overlay for RDCDSPEC in RDCBK
    *
    *     +-------------+-------------+-------------+-------------+
    *  78 |  RDCTCYL    |  RDCPCYL    |  RDCDEVLM   |  RDCMAXPR   |
    *     +-------------+------+------+------+------+-------------+
    *  80 |  RDCMASK    |:PPTRK|:TPGEX|:PAGFG|:FLAG |/////////////|
    *     +-------------+------+------+------+------+-------------+
    *  88 |         RDCCPVOL          |         RDCMLOAD          |
    *     +---------------------------+---------------------------+
    *  90 |                       RDCNPSEC                        |
    *     |                                         +-------------+
    *  98 |                                         |             |
    *     +-----------------------------------------+             |
    *     |                       RDCSECTR                        |
    *     |                           +---------------------------+
    *  A8 |                           |         RDCDPSBK          |
    *     +---------------------------+---------------------------+
    *  B0 |         RDCQRTIM          |///////////////////////////|
    *     +---------------------------+///////////////////////////|
    *     |///////////////////////////////////////////////////////|
    *     |///////////////////////////////////////////////////////|
    *     +-------------------------------------------------------+
    *  C8
    *
    *** Overlay for RDCDSPEC in RDCBK

    *** Overlay for RDCFEAT in RDCBK
    *
    *                                               +------+------+
    *   0 ...                                     6 |:VFAC |:VFAC2|
    *     +------+------+---------------------------+------+------+
    *   8 |//////|:SFEAT| A
    *     +------+------+
    *
    *** Overlay for RDCFEAT in RDCBK

    *** Overlay for RDCDEVF1 in RDCBK
    *
    *                                 +-------------+-------------+
    *   8 ...                       C |  RDCMCYL    |  RDCTPCYL   |
    *     +------+--------------------+-------------+------+------+
    *  10 |:SECT |     RDCTOTRK       |   RDCHA     |:MODE |(017)-|
    *     +------+--------------------+-------------+------+------+
    *  18 |         -RDCMDFR          |  RDCALTCL   |  RDCALTRX   |
    *     +-------------+-------------+-------------+-------------+
    *  20 |  RDCDIAG    |  RDCDIAGN   |  RDCDVCYL   |  RDCDVTRK   |
    *     +-------------+-------------+-------------+-------------+
    *  28
    *
    *** Overlay for RDCDEVF1 in RDCBK

    *** Overlay for RDCDEVF2 in RDCBK
    *
    *                   +------+------+-------------+------+------+
    *  28 ...        2A |:CUTYP|:MRTPL|  RDCMXR0    |RDC46 |:TRSSZ|
    *     +------+------+------+------+------+------+------+------+
    *  30 |:ATCCF|  RDC4950    |:LTHRS|RDC52 |:UTHRS|:DCUF |RDC55 |
    *     +------+------+------+------+------+------+------+------+
    *  38 |:RCUC |:OBRCO|                RDC5863                  |
    *     +------+------+-----------------------------------------+
    *  40
    *
    *** Overlay for RDCDEVF2 in RDCBK

    *** Overlay for RDCFEAT in RDCBK
    *
    *                                               +-------------+
    *   0 ...                                     6 |/////////////|
    *     +------+------+---------------------------+-------------+
    *   8 |:OPER |:FBAFT| A
    *     +------+------+
    *
    *** Overlay for RDCFEAT in RDCBK

    *** Overlay for RDCDEVF1 in RDCBK
    *
    *                                 +-------------+-------------+
    *   8 ...                       C |  RDCRECSZ   | RDCBLKCG-   |
    *     +-------------+-------------+-------------+-------------+
    *  10 |   -(00E)    |         RDCBLKAP          | RDCBLKMA-   |
    *     +-------------+---------------------------+-------------+
    *  18 |   -(016)    |         RDCBLKFA          |/////////////|
    *     +-------------+---------------------------+-------------+
    *  20 |  RDCBLKCE   |/////////////////////////////////////////|
    *     +-------------+-----------------------------------------+
    *  28
    *
    *** Overlay for RDCDEVF1 in RDCBK

    *** Overlay for RDCFEAT in RDCBK
    *
    *                                               +-------------+
    *   0 ...                                     6 |/////////////|
    *     +------+------+---------------------------+-------------+
    *   8 |:FET3 |:FETFE| A
    *     +------+------+
    *
    *** Overlay for RDCFEAT in RDCBK

    *** Overlay for RDCDEVF1 in RDCBK
    *
    *                                 +---------------------------+
    *   8 ...                       C |///////////////////////////|
    *     +---------------------------+///////////////////////////|
    *     |///////////////////////////////////////////////////////|
    *     |///////////////////////////////////////////////////////|
    *     +--------------------+------+---------------------------+
    *  20 |     RDCLIBSQ       |:LIBID|///////////////////////////|
    *     +--------------------+------+---------------------------+
    *  28
    *
    *** Overlay for RDCDEVF1 in RDCBK

    *** Overlay for RDCDEVF2 in RDCBK
    *
    *                   +-----------------------------------------+
    *  28 ...        2A |                                         |
    *     +-------------+                                         |
    *     |                       RDCTAPE2                        |
    *     |                                                       |
    *     +-------------------------------------------------------+
    *  40
    *
    *** Overlay for RDCDEVF2 in RDCBK

    *** Overlay for RDCFEAT in RDCBK
    *
    *                                               +------+------+
    *   0 ...                                     6 |:FRMAT|//////|
    *     +------+------+-------------+------+------+------+------+
    *   8 |//////|//////|/////////////|:SSF20|:SSF21|:SSF22|:SSF23|
    *     +------+------+------+------+------+------+------+------+
    *  10 |:DVTYM|  RDCDVMPL   |     RDCDVSEQ       |:CUTYM|(017)-|
    *     +------+-------------+------+------+------+------+------+
    *  18 |-(017)|     RDCCUSEQ       |//////|:LBTYM|//////|RDCEPI|
    *     +------+-------------+------+------+------+------+------+
    *  20 |////////////////////|//////|  RDCVLLID   |:DEVID|//////|
    *     +------+------+------+------+-------------+------+------+
    *  28 |//////|//////|:DVCOD| 2B
    *     +------+------+------+
    *
    *** Overlay for RDCFEAT in RDCBK

#### RDCBK Cross Reference

    Symbol         Dspl Value
    -------------- ---- -----
    RDCALTCL       001C
    RDCALTRX       001E
    RDCASYNC       0049 10
    RDCATCCF       0030
    RDCBLKAP       0012
    RDCBLKCE       0020
    RDCBLKCG       000E
    RDCBLKFA       001A
    RDCBLKMA       0016
    RDCBURST       0008 20
    RDCCASS        0049 80
    RDCCFLF        0009 40
    RDCCFW         0009 80
    RDCCMPCT       0009 40
    RDCCMTBA       0060
    RDCCPNOP       0008 04
    RDCCPOWN       0084 01
    RDCCPTA        005C
    RDCCPVOL       0088
    RDCCRSA        0058
    RDCCUFT        0049
    RDCCUIBK       0049 04
    RDCCUID        0000
    RDCCUMN        0002
    RDCCUMPL       0017
    RDCCUSEQ       0019
    RDCCUTYM       0016
    RDCCUTYP       002A
    RDCDALEN       002A 00000040
    RDCDATA        0000
    RDCDATCH       0008 10
    RDCDCHAR       0044
    RDCDCUF        0036
    RDCDEVF1       000C
    RDCDEVF2       002A
    RDCDEVID       0026
    RDCDEVLM       007C
    RDCDFW         0009 04
    RDCDIAG        0020
    RDCDIAGN       0022
    RDCDPSBK       00AC
    RDCDSPEC       0078
    RDCDUP         0009 08
    RDCDVCLS       004A
    RDCDVCOD       002A
    RDCDVCYL       0024
    RDCDVFTR       004C
    RDCDVID        0003
    RDCDVMN        0005
    RDCDVMPL       0011
    RDCDVSCL       004F
    RDCDVSEQ       0013
    RDCDVTRK       0026
    RDCDVTYM       0010
    RDCDVTYP       004B
    RDCEPI         001F
    RDCERPA        0050
    RDCERSA        0054
    RDCEXFC        0008
    RDCFBA         0048 10
    RDCFBAFT       0009
    RDCFBARE       0008
    RDCFEAT        0006
    RDCFEAT3       0009
    RDCFETFE       0009
    RDCFET3        0008
    RDCFIXHM       0009 04
    RDCFLAG        0085
    RDCFLASH       0049 02
    RDCFLGS        0048
    RDCFRMAT       0006
    RDCHA          0014
    RDCLAFIN       0009 08
    RDCLBTYM       001D
    RDCLEN         0078 000000C8
    RDCLERPA       0064
    RDCLERSA       0068
    RDCLIBID       0023
    RDCLIBON       0009 10
    RDCLIBSQ       0020
    RDCLRE         0085 02
    RDCLTHRS       0033
    RDCMASK        0080
    RDCMAXPR       007E
    RDCMCYL        000C
    RDCMDC         0085 01
    RDCMDFR        0017
    RDCMDRID       0028
    RDCMEDSC       000E 04
    RDCMINID       0084 02
    RDCMIRR        0036 04
    RDCMLOAD       008C
    RDCMODE        0016
    RDCMODST       000D 04
    RDCMOVAM       0009 08
    RDCMPLF        0009 40
    RDCMRTPL       002B
    RDCMXR0        002C
    RDCNCRNT       0048 40
    RDCNEXT        0040
    RDCNOSR        0049 20
    RDCNPSEC       0090
    RDCNTP         0006 01
    RDCOBRCO       0039
    RDCOBRID       0029
    RDCOFFSP       0048 20
    RDCOLDT        0006 00
    RDCOPER        0008
    RDCOSCLS       000A
    RDCOSCOD       000A
    RDCOSTYP       000B
    RDCOVRRN       0008 40
    RDCPAGFG       0084
    RDCPAGOY       0084 04
    RDCPCYL        007A
    RDCPPRC        0008 20
    RDCPPTRK       0082
    RDCPRFX        0006 02
    RDCQRTIM       00B0
    RDCRC          004E
    RDCRCACH       0009 20
    RDCRCS         0009 20
    RDCRCUC        0038
    RDCRDFWD       000D 80
    RDCRDMN        004D
    RDCRECSZ       000C
    RDCREMOV       0009 40
    RDCRRLSE       0009 20
    RDCRSTNT       0049 08
    RDCSECT        0010
    RDCSECTR       009E
    RDCSFEAT       0009
    RDCSICS        0049 40
    RDCSIZE        0078 00000019
    RDCSNGEX       0083 00000001
    RDCSQUY        006C
    RDCSSCRC       0006 04
    RDCSSCSP       0006 08
    RDCSSF1        0007
    RDCSSF2        000C
    RDCSSF20       000C
    RDCSSF21       000D
    RDCSSF22       000E
    RDCSSF23       000F
    RDCSSUPT       0048 01
    RDCSTATS       0048
    RDCSUPT        0048 80
    RDCTAPE1       000C
    RDCTAPE2       002A
    RDCTCUIR       0008 08
    RDCTCYL        0078
    RDCTOTRK       0011
    RDCTPCYL       000E
    RDCTPGEX       0083
    RDCTRAM        0008 10
    RDCTRSSZ       002F
    RDCTSSCS       000E 20
    RDCUTHRS       0035
    RDCVFAC        0006
    RDCVFAC2       0007
    RDCVLLID       0024
    RDCVPAVU       0007 40
    RDC46          002E
    RDC4950        0031
    RDC52          0034
    RDC55          0037
    RDC5863        003A

This information is based on z/VM V5R2.0. Last updated on 12 Apr 2006 at 17:19:44 EDT.
Copyright IBM Corporation, 1990, 2005