IBM 3745 Service Functions page 21

- ----------~-~----------- ------------~------.
MSA (CCU)
Fields G and M
Field H
2A Control program loader/control program abend on a
channel-attached 3745 control program.
40 Load dump request from disk.
44 Dump to disk in progress.
48 Control program load from disk in progress.
60 Control program loader/dump request from disk abend.
64 Control program loader/dump from disk abend.
68 Control program loader/control program from disk abend.
yyzz indicates the IPL port address. This encoded address is dis-
played in decoded form in field D of the IPL information, except
when xx
=
00, in which case:
• yy indicates the link ports defined in the link IPL port table.
• zz indicates the link IPL ports that are presently enabled.
They are displayed when the CCU status is STOP X70', STOP PGM, STOP BT,
STOP AC, or HARDSTOP (see field H).
LAR=xxxxxx OP=xxxx C=x (field G)
IAR=xxxxxx ILVL=xxxx Z=x (field M)
LAR=xxxxxx
OP=xxxx
C=x
IAR=xxxxxx
IlVl=xxxx
Z=x
Address of the last executed instruction.
Last executed instruction.
Value of the C-Iatch (0 or 1).
Address of the next instruction to be executed.
Active CCU interrupt levels (1 to 4).
Value of the Z-Iatch (0 or 1).
CCU INTERRUPTS DISABLED
nothing displayed
(field
G)
(field
M)
No interrupts can be received from the CCU:
• During a MOSS IML from the control panel, just after power ON.
• While performing CCU IPL to avoid automatic CCU re-IPL in case of
hardcheck (see field G).
• While mounting a new diskette (service personnel only).
• While performing some utility programs (service personnel only) to prevent
interference. All communications between the CCU and MOSS are
delayed (a BER generated by the control program is kept until the utility
program ends and MOSS is back online).
CCU REGISTERS
NOT ACCESSIBLE
(in field G)
(in field M)
Appropriate registers cannot be read, so it is impossible to display LAR, OP,
C, IAR, ILVL, and Z information.
CCU status:
DOWN
HARDCHK
HARDSTOP
IPl-REQ
A hardware error occurred on the CCU.
The control program stopped on a hardcheck error. An auto-
matic re-IPL is attempted. In certain cases however, (for
example if the hardcheck occurs during a general IPL) there is
no re-IPL.
You selected the CCU check reset function to reset the CCU
check condition. To restart, select the CCU start function in
the 3745 function menu or press F6 (CCU start, or S) if dis-
played on the screen.
A CCU IPL was requested and is in progress.
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3745 Service Functions
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