The address of the first RCUBLOK is found in the
(displacementX'3BS') of the PSA. General register 7
currentRCUBLOK. Examine the following fields: ARlOCU field
points tothe 1. The RCUADD field (displacement X'OO') contains the real control
unit address.
2. The value of theRCUSTAT field (displacement X'04') describes the
status of the control unit:
3.4. 5.
6.
7.S. Value of RCUSTAT X'SO,-- X'40' X'20' X'OS' X'04' X'02' X' 0 l' Comllents Contror-unit busy lOB scheduled On control unit
Control unit disabledRCUCHA to RCHBLOK path not available RCUCHB to RCHBLOK path not available RCUCHC to RCHBLOK path not available RCUCHD to RCHBLOK path not available RCUCHA (displacement 1'10') points to the Primary RCHBLOK. RCUCHB (displacement 1
1
14') points to the first alternate RCHELOK. RCUCHC (displacement I'1S') points to the second altsrnate RCHBLOK. RCUCHD (displacement X' 1C') points to the third alternate RCHBLOK.
The value of theRCUTYPE field (displacement X' 05') describes the
type of the real control unit:
CommentsValue of RCUTYPE X'SO'-- ThiS-Control unit can attach
Subordinate control unit
to only one subchannelX'40' X' 0 l' X'02' X'03' TCU is a 2701 TCU is a 2702 TCU is a 2703
TheRCUFlOB field (displacement I'OS') points to
in the queue and theRCULIOB field (displacement
the lastlOBLOK in the queue.
the firstIOBLCK X'OC') points to
The address of the firstRDEVBLOK is found in the ARIODV field
(displacementX'3BC') of the PSA. General register 8 points to the
currentRDEVBLOK. Also, the VDEVREAL field X'24') of each YDEVBLOK contains the address of the associated RDEVBLOK. Examine the
following fields of theRDEVBLOK: 1. The RDEVADD field (displacement X'OO') contains the real device
address.Part 1. Debugging with V"/370 57
(displacement
current
points to
unit address.
2. The value of the
status of the control unit:
3.
6.
7.
Control unit disabled
1
14')
The value of the
type of the real control unit:
Comments
Subordinate control unit
to only one subchannel
The
in the queue and the
the last
the first
The address of the first
(displacement
current
following fields of the
address.