Page of SY20-0884-3 As Updated Aug. 1, 1979 by TNL SN25-0497 RCUBLOK RCUBLOK provides control and status information on a defined real control unit. Linkages
are provided to queuedIOBLOKs. The ARIOCU field of the PSA points to the first RCUBLOK,
which is generated in contiguous storage.
Hexadecimal
o
810 18 20 28 30 Displacement
------------0 2 4 5
6
8
C10 10 RCUADD RCULOCK R*1 I R*2 RCUQCNT RCUFIOB RCULIOB RCUCHA RCUCHB RCUCHC RCUCHD RCURSTQ RCUOPER RCUCUBSY RCURSV1 RCUDVTBL (Variable Length) L- ______________________________________________________ . ___________ Field
Name Field Description, Contents, Meaning
--------------------------------------
RCUADDDS 1H Control unit address RCULOCK DS 1H Control unit lock RCUSTAT DS 1X R*1 Control unit status defined in RCUSTAT RCUBUSY EQU -X'80'--- Control unit busy RCUSCED EQU X'40' lOB scheduled on control unit RCUDISA EQU X'20' Control unit disabled RCUCHAOF EQU X'OS' RCUCHA to RCHBLOK path is not available RCUCHBOK EQU X'04 ' RCUCHB to RCHBLOK path is not available RCUCHCOF EQU X'02' RCUCHC to RCHBLOK path is not available RCUCHDOF EQU X'01' RCUCHD to RCHBLOK path is not available RCUTYPE DS 1X R*2 Control unit type in RCUTYPE RCUSHRD EQU --X'80-' --
This control unit can be attached to onlyone subchannel RCUSUB EQU X'40' This is a subordinate control unit RCU2703 EQU X'03' TCU is a 2703 RCU2702 EQU X'02' TCU is a 2702 RCU2701 EQU X'01' TCU is a 2701 RCUQCNT DS 1H Number of IOBLOKs queued off control unit RCUFIOB DS 1F Pointer to first IOBLOK queued RCULIOB DS 1F Pointer to last IOBLOK queued
RCUCHADS 1F Pointer to RCHBLOK -path A ORG RCUCHA RCUPRIME DS 1F Pointer to the primary control unit
82IBM VM/370 Data Areas and Control Block Logic
are provided to queued
which is generated in contiguous storage.
Hexadecimal
o
8
------------
6
8
C
Name Field Description, Contents, Meaning
--------------------------------------
RCUADD
This control unit can be attached to only
RCUCHA
82