Position (listed in IOA
assignment order)
Possible failing
component DSA (BBBBCcbb) Unit address
D06, D11 Disk unit The disk unit has the same
DSA as the IOP controlling
the storage IOA.
xy0100FF (where x is the same as
the first character of the xFFFFFFF
IOA Unit Address and y is I/O bus 0,
1, 2, or 3. 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 D06 or
D11.)
D07, D12 Disk unit The disk unit has the same
DSA as the IOP controlling
the storage IOA.
xy0200FF (where x is the same as
the first character of the xFFFFFFF
IOA Unit Address and y is I/O bus 0,
1, 2, or 3. 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 D07 or
D12.)
D08, D13 Disk unit The disk unit has the same
DSA as the IOP controlling
the storage IOA.
xy0300FF (where x is the same as
the first character of the xFFFFFFF
IOA Unit Address and y is I/O bus 0,
1, 2, or 3. 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 D08 or
D13.)
D09, D14 Disk unit The disk unit has the same
DSA as the IOP controlling
the storage IOA.
xy0400FF (where x is the same as
the first character of the xFFFFFFF
IOA Unit Address and y is I/O bus 0,
1, 2, or 3. 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 D09 or
D14.)
D10, D15 Disk unit The disk unit has the same
DSA as the IOP controlling
the storage IOA.
xy0E00FF (where x is the same as
the first character of the xFFFFFFF
IOA Unit Address and y is I/O bus 0,
1, 2, or 3. 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 D10 or
D15.)
D17 Tape 0001-20-00 610600FF
Analyze hardware problems 331