IBM 3745 Series Service Functions page 27

MSA (CCU Information)
Field L
Field M
AC HIT12 (highlighted). Two single-address compares are successful on
the first and second address.
Updated each time an output X'72' instruction is executed by the control
program. For example, when using the CCU data exchange function, the
control program procedures, or the 3745 initialization.
The
Output X'72'
contents are buffered. If the buffers are overrun because of
intensive output, some data may be lost; however, the last value outputted will
be displayed.
X72=xxxxxx
X72=OOxxxx
X72=ERROR
Contents of CCU X'72' output register.
Control program load/dump (CLOP) abend code (refer to the
IPLlIML chapter of the Maintenance Information Reference
manual, SY33-2056, for abend codes list).
Error when accessing the register. Register contents cannot
be displayed.
Field 'M' is displayed along with field "G" when the CCU is in the STOP state.
(See field 'G' description).
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3745 Communication Controller