NAME       : HCPCHRBK
 DESCRIPTION: DEVICE / SUBCHANNEL INDEX STRUCTURE
 DSECT      : CHRBK
 FUNCTION   : THE DEVICE / SUBCHANNEL RADIX TREE BLOCK IS USED
              TO REPRESENT THE DEVICE BLOCK INDEX STRUCTURE
 LOCATED BY : HCPRIOIX and HCPRIOIA contain the radix tree
              for the real device numbers (in the default
              subchannel set and the alternate subchannel set
              respectively) which addresses the CHRBK for the
              first digit of the device number.
 CREATED BY : CHRBK'S ARE DYNAMICALLY CREATED BY CALLING
              HCPFREE
 DELETED BY : CHRBK'S ARE DELETED BY CALLING HCPFRET
 RELOCATION CONSIDERATIONS : None
 COMMENTS   : NONE

 CHRBK DSECT
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Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      CHRBK          DEVICE / SUBCHANNEL INDEX STRUCTURE
0000    0 Signed       4 CHRINDX0       INDEX FOR DIGIT 0 MOD 16
0004    4 Signed       4 CHRINDX1       INDEX FOR DIGIT 1 MOD 16
0008    8 Signed       4 CHRINDX2       INDEX FOR DIGIT 2 MOD 16
000C   12 Signed       4 CHRINDX3       INDEX FOR DIGIT 3 MOD 16
0010   16 Signed       4 CHRINDX4       INDEX FOR DIGIT 4 MOD 16
0014   20 Signed       4 CHRINDX5       INDEX FOR DIGIT 5 MOD 16
0018   24 Signed       4 CHRINDX6       INDEX FOR DIGIT 6 MOD 16
001C   28 Signed       4 CHRINDX7       INDEX FOR DIGIT 7 MOD 16
0020   32 Signed       4 CHRINDX8       INDEX FOR DIGIT 8 MOD 16
0024   36 Signed       4 CHRINDX9       INDEX FOR DIGIT 9 MOD 16
0028   40 Signed       4 CHRINDXA       INDEX FOR DIGIT A MOD 16
002C   44 Signed       4 CHRINDXB       INDEX FOR DIGIT B MOD 16
0030   48 Signed       4 CHRINDXC       INDEX FOR DIGIT C MOD 16
0034   52 Signed       4 CHRINDXD       INDEX FOR DIGIT D MOD 16
0038   56 Signed       4 CHRINDXE       INDEX FOR DIGIT E MOD 16
003C   60 Signed       4 CHRINDXF       INDEX FOR DIGIT F MOD 16
          ..11 11..      CHROMASK       CHRINDXF-CHRINDX0 CHROMASK MASK
                                        TO ISOLATE THE OFFSET TO
                                        INDX0-INDXF
          00000008       CHRSIZE        (*-CHRBK+7)/8 SIZE OF BLOCK IN
                                        DBW'S

          
*** CHRBK - DEVICE / SUBCHANNEL INDEX STRUCTURE
*
*     +---------------------------+---------------------------+
*   0 |         CHRINDX0          |         CHRINDX1          |
*     +---------------------------+---------------------------+
*   8 |         CHRINDX2          |         CHRINDX3          |
*     +---------------------------+---------------------------+
*  10 |         CHRINDX4          |         CHRINDX5          |
*     +---------------------------+---------------------------+
*  18 |         CHRINDX6          |         CHRINDX7          |
*     +---------------------------+---------------------------+
*  20 |         CHRINDX8          |         CHRINDX9          |
*     +---------------------------+---------------------------+
*  28 |         CHRINDXA          |         CHRINDXB          |
*     +---------------------------+---------------------------+
*  30 |         CHRINDXC          |         CHRINDXD          |
*     +---------------------------+---------------------------+
*  38 |         CHRINDXE          |         CHRINDXF          |
*     +---------------------------+---------------------------+
*  40
*
*** CHRBK - DEVICE / SUBCHANNEL INDEX STRUCTURE

 
Symbol         Dspl Value
-------------- ---- -----
CHRINDXA       0028
CHRINDXB       002C
CHRINDXC       0030
CHRINDXD       0034
CHRINDXE       0038
CHRINDXF       003C
CHRINDX0       0000
CHRINDX1       0004
CHRINDX2       0008
CHRINDX3       000C
CHRINDX4       0010
CHRINDX5       0014
CHRINDX6       0018
CHRINDX7       001C
CHRINDX8       0020
CHRINDX9       0024
CHROMASK       003C 3C
CHRSIZE        003C 00000008