performed by the instructions when the test character comparison control is zero test comparison occurs which ensures compatibility with prior code that does not specify the new m 3 operand the m 3 field is defined to be an optional operand for the translate n to n instructions as defined to the higher level assembler the default value for the m 3 operand if it is not specified is zero ensuring compatibility with the previous operation of the translate n to n instructions of the non enhanced eft2 in addition for translate two to one and translate two to two the alignment requirements for the translate table are relaxed when the eft2 u2014 enhancement facility is installed the translation table specified by general register 1 gr 1 is assumed to be on a double word boundary for all four of the translate n to n instructions unassigned bits 0 2 are unassigned and should contain zeros to ensure future program operational compatibility test character comparison control c the c bit bit 3 of the m 3 field controls test character comparison when the c bit is set to zero test character comparison is performed when the c bit is one test character comparison.