Subset/Superset DIMOD Names

All of the operands except TRC=YES allow subsetting. A module name specifying B is a superset of the module specifying I, for example. IJJFCBID is a superset of the module IJJFCIID.

The IBM-supplied preassembled logic modules do not have TRC=YES. The system programmer can reassemble them with TRC=YES to support 3800 table reference characters. Although the code that is generated for a module assembled with TRC=YES is different from the code that is generated for a module with TRC=NO, the module name is the same. If some, but not all DIMOD logic modules are reassembled this way, it might interfere with subsetting or supersetting. 
 
                *  +  +  *
    I  J  J  F  C  B  I  C
                V  I  Z  D
+
Subsetting/supersetting permitted.
*
No subsetting/supersetting permitted.