3-6 Testing
and
Troubleshooting
Service Processor Code
The service processor code gathers diagnostic data, interprets the data,
and
displays the informa-
tion
in
a convenient form on the service panel. The code resides
in
ROM
within the service
processor chip which
is
located on the system control module (SCM).
The service processor code monitors the
LED
signal coming from the 12 processor stack boards.
The code also receives instructions from the operating system or loader code through register
10
(RIO)
on
the SCM.
Figure 3-3
is
a flowchart of the service processor code.
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