Addressing errors

openUTM overwrites the first 4 KB of the KDCROOT table module and sets up write protection for the first page of KDCROOT to support the search for addressing errors in application programs. This reveals impermissible accesses to the table module (address error, PEND ER). Such accesses occur, for example, as the result of incorrectly transferred addresses (KB, SPAB, etc.) or incorrect register specifications.

Errored accesses to the address zero

If you have activated the test function described on "Testing for errors when accessing the address zero" then the program unit is aborted by an STXIT event (STXIT with IW = 48 or 5C) if address 0 is accessed during the operation of the application.

The program unit can then be modified.