Example 1

To create a nucleus extension named MYNUC, add the following record in the logical segment definition file for the MYSEG logical saved segment:
MODULE MYNUC * (SYSTEM)

MYNUC is entered in key zero and disabled for interrupts. The addressing mode is determined by the way you code the program and the location in the virtual machine where the logical saved segment is loaded. To save MYNUC across an abend, you must specify the SYSTEM option on the SEGMENT LOAD command or code the SYSTEM parameter on the SEGMENT LOAD macro when you load the logical saved segment