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Using Subfunctions: To work with subfunctions, do the following:
1. Use the Increment or Decrement buttons to select the appropriate function and
press Enter. The function number appears with asterisks (**); for example, 57**.
The two asterisks indicate that subfunctions are available.
2. Press the Increment button. The first subfunction number appears; for example,
5700.
3. As the subfunction number is displayed, press Enter. The data associated with
the subfunction number is displayed.
4. Press the Increment button. The next subfunction number appears; for example,
5701.
5. As the subfunction number is displayed, press Enter. The data associated with
the new subfunction number is displayed.
6. Repeat these steps to gather all the data that is associated with the subfunction.
7. Use the Increment or Decrement buttons to return to the function display with
asterisks; for example 57**.
8. Press Enter to exit the subfunctions.
Function 50–System Processor Stop: This function stops the system processor.
Attention: This function might cause the system to end abnormally. Use only when
directed by your next level of support.
Function 51–System Processor Status: This function displays the following
values:
v Next instruction address (NIA)
v Current task dispatching element (TDE) address
The data can be displayed 8 digits at a time. Select and enter a subfunction
number to display each word of data from 00 to 0F.
Table 34 is an example of a subfunction data display that shows NIA and TDE
information.
Table 34. Subfunction data display example
Function Subfunction Data Display
51 ** Subfunction mode entered
51 00, 01 NIA (8 bytes)
51 02, 03 Current TDE (8 bytes)
Function 52–System Processor Start: This function starts the system processor
(after it has stopped).
Function 53–Repeat GARD: The purpose of the Repeat GARD function is to
permanently de-configure an intermittently failing processor in case the IPL
diagnostics cannot detect the failure and de-configure it. Repeat GARD will
de-configure the failing processor during the IPL following the failure. The failing
processor must be replaced or the Repeat GARD function must be cleared before
that processor can be used again.
Attention: This function can cause a good processor to be permanently
de-configured following a power failure. Use only when directed by your next
level of support.
Chapter 5. Control Panel Functions 187
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