System reference code (SRC) address formats

Use this procedure to determine the IOP, IOA, or device address from either a control panel or a console display.

1. Was the SRC and addressing information obtained either from a control panel display, the Main Storage Dump Manager display, or the HMC Partition Properties Reference Code words display?
   • No: Contact your next level of support. This ends the procedure.
   • Yes: Addressing information is in the Bus-Bus-Bus-Bus/Card-card/board-board (BBBBCcbb) format as follows:
     • If characters 7 and 8 of the top 16-character line of function 12 (word two) are 60:
       • The direct select address is characters 1-8 of the bottom 16-character line of function 12 (word four) in the format "BBBBCcbb".
       • The device address is characters 9-16 of the bottom 16-character line of function 12 (word five) in the format "abcd efgh".
     • If characters 7 and 8 of the top 16-character line of function 12 (word two) are 13, 17, 27, or 29:
       • The direct select address is characters 9-16 of the top 16-character line of function 12 (word three) in the format "BBBBCcbb".
       • The device address is characters 1-8 of the bottom 16-character line of function 12 (word four) in the format "abcd efgh".
     • If characters 7 and 8 of the top 16-character line of function 12 (word two) are 62:
       • The direct select address may be characters 9-16 of the top 16-character line of function 13 (word seven) in the format "BBBBCcbb".
       • The device address may be characters 1-8 of the top 16-character line of function 13 (word six) in the format "abcd efgh".
     Go to step 2.
2. The BBBBCcbb format is the hexadecimal direct select address of a card location in the system unit. The format definition is:
   • BBBB--System Bus
   • Cc--System Card
   • bb--System Board

   Continue with the next step for IOA and device address information.

3. Unit (Device) Address Definitions are explained in an "abcd efgh" format. For example, if the unit address is 0001 00FF, the address relates to the "abcd efgh" format as follows:
   Figure 5. Example of Unit (Device) Address definitions

              0 0 0 1    0 0 F F  
             (a b c d    e f g h)

   The characters "abcd efgh" can have different meanings, depending on the subsystem that reports the problem. However, they define the information that is contained in the unit (device) address as follows.

   Table 35. Character definitions

   Disk, tape, or optical
   a	I/O adapter
   b	I/O bus
   cd	Controller
   ef	Device
   gh	FF
   Communications
   a	I/O bus
   b	Adapter
   c	0
   d	Port
   e	0
   f	Channel
   GH	FF
   Workstation
   a	I/O Bus
   b	Adapter
   cd	Port
   e	0
   f	Device
   g	0
   h	Session

   Note:
   If the failing item or procedure that sent you here indicates that the I/O adapter is the failing item, but you only have a device address, convert the device address into an I/O adapter address by making the last 7 digits FFFFFFF so that the address becomes xFFFFFFF, where x is the I/O adapter number.
   Note:
   If the unit (device) address appears as FFFF FFFF, the address cannot be determined.
   This ends the procedure.