Position
Possible
failing
component DSA (BBBBCcbb) Unit address
D14, D20 Disk unit The disk unit has the
same DSA as the IOP
controlling the Storage
IOA.
xy0F00FF (where x is the same as the first character of the
xFFFFFFF IOA Unit Address and y is I/O bus 0, 1 or 2. Storage
IOA I/O buses begin with 0 and are numbered from the tailstock
toward the middle of the card. Find the storage IOA with the
same DSA and xFFFFFFF address, then trace the I/O bus cable
to determine if the position is D14 or D20.)
Addresses — Model 820
For use by authorized service providers.
Use the address to find the location. Then go to “Locations — Model 820” on page 248 to find additional
information.
Table 1. IOP, IOA, and device address information for Model 820
Position (listed in IOA
assignment order)
Possible Failing
Component
DSA (BBBBCcbb) Unit Address
Note: IOA and device
DSA’s will not follow the
rules below if the IOA is
manually reassigned after
IPL.
MB1 Embedded IOP 0001-10-00 FFFFFFFF
MB1 Service Processor 0001-70-00 FFFFFFFF
C06 Communication, workstation
IOA
0001-10-00 E1FFFFFF
C05 Storage IOA 0001-10-00 2FFFFFFF
C04 (IXS capable position) IOP 0001-13-00 FFFFFFFF
C04 (IXS capable position) Storage IOA 0001-10-00 3FFFFFFF
C04 (IXS capable position) Communication, workstation
IOA
0001-10-00 E3FFFFFF
C03 (empty if IXS in C04) IOP 0001-14-00 FFFFFFFF
C03 (empty if IXS in C04) Storage IOA The IOA has the same DSA
as the first IOP found in the
following list: C04, MB1.
4FFFFFFF
C03 (empty if IXS in C04) Communication, workstation
IOA
The IOA has the same DSA
as the first IOP found in the
following list: C04, MB1.
E4FFFFFF
C02 IOP 0001-16-00 FFFFFFFF
C02 Storage IOA The IOA has the same DSA
as the first IOP found in the
following list: C03, C04,
MB1.
6FFFFFFF
C02 Communication, workstation
IOA
The IOA has the same DSA
as the first IOP found in the
following list: C03, C04,
MB1.
E6FFFFFF
Analyze hardware problems 327
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