IBM i 830 Repair Manual page 953

Figure 63. Format Conversion
12. Unit (Device) Address Definitions are explained in an "abcd efgh" format. For
Disk Unit example
without I/O adapter
(Address Type A)
0 1 0 0 F F F F
a b c d e f g h
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.
Communications
a
b
c
d
e
f
gh
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.
example, if the unit address is 0100 FFFF or 0001 00FF, the address relates to
the "abcd efgh" format as follows:
Disk Unit example
with I/O adapter
(Address Type B)
0 0 0 1
OR
a b c d
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:
I/O Bus
Adapter
0
Port
0
Channel
FF
Chapter 6. Data Recovery Procedures and General System Information
SRC Address Formats
0 0 F F
e f g h
Disk, Tape, or Optical without I/O adapter
address (Type A)
a I/O Bus
b Controller
c 0
d Device
efgh FFFF
939