IBM iSeries 270 Service Manual page 588

Cc—System Card
bb—System Board
Continue with the next step for IOA and device address information.
Unit (Device) Address Definitions are explained in an "abcd efgh" format. For example, if the unit
9.
address is 0001 00FF, the address relates to the "abcd efgh" format as follows:
Figure 3. Example of Unit (Device) Address Definitions
0 0 0 1
^ ^ ^ ^
V V V V
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.
Table 2. Character definitions
Disk, tape, or optical
a
b
cd
ef
gh
a
b
c
d
e
f
GH
Workstation
a
b
cd
e
f
g
h
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.
10. OS/400 communication-diagnostic panels that are displayed by the commands VFYCMN, WRKPRB,
and ANZPRB use the following address format:
576
Hardware (Remove and Replace; Part Locations and Listings)
0 0 F F
^ ^ ^ ^
V V V V
e f g h
Communications
I/O adapter
I/O bus
Controller
Device
FF
I/O bus
Adapter
0
Port
0
Channel
FF
I/O Bus
Adapter
Port
0
Device
0
Session