Note: When converting from Bus/Board/Card format to Bus-Bus-Bus-
Bus/Card-Card/Board-Board format, the numbers must be converted
from Decimal to Hexadecimal.
12. Unit (Device) Address Definitions are explained in an “abcd efgh” format. For
example, if the unit address is 0100 FFFF or 0001 00FF, the address relates to
the “abcd efgh” format as follows:
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:
Communications
a I/O Bus
b Adapter
c 0
d Port
e 0
f Channel
gh FF
Disk, Tape, or Optical without I/O adapter
address (Type A)
a I/O Bus
b Controller
c 0
d Device
efgh FFFF
Figure 63. Format Conversion
Disk Unit example Disk Unit example
without I/O adapter with I/O adapter
(Address Type A) (Address Type B)
0100 FFFF 0001 00FF
OR
abcd efgh abcd efgh
Note: Type A IOPs that do not have the additional adapter addressing are
2621, 2624, 2644, 6112, 6500, 6501, 6502, 6512, 6513, 6530, 916x,
and 918x. All other IOPs or storage adapters have the additional
adapter addressing and use the Type B address format.
Figure 64.
SRC Address Formats
Chapter 6. Data Recovery Procedures and General System Information 939
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