IBM System/7 Functional Characteristics - All about the IBM 1130 ...

Interchange Register (PIR)0 5 8 15Op codeModifier1 1 1 1 1 X X X 0 0 0 011 0 1 0I III I IF 8-F 0 AThe contents of the accumulator are interchanged with the contents of the registerspecified by the R field. The contents of the accumulator are placed in the specifiedregister, and the initial contents of the register are placed in the accumulator. Thoughthe carry and overflow indicators do not change, the result indicators are changed toreflect the final contents of the accumulator.If It=000, the accumulator is interchanged with itself. This results in a no-operationbecause the contents of the accumulator are interchanged with themselves and, effectively,no change takes place. In this case, the result indicators are not changed.Example:0 5 8 15PIR instructionOp codeModifier1 1 1 1 1 0 1 0 0 0 0 0 1 1 0 1 0I I 1111111F A0 ABefore PI R operationAccumulator Index register 20 15 0 151 1 0 0 0 0 1 1 1 1 1 0 0 1 0 011'11111'1111i!C 30 0I1 0 1 0 1 1 0i1111110 0 1 1 0 1II tit IE 4 2 B 1 A00After PI R operationAccumulator0Index register 215 0 150 0 1 0 11 0 12 B1 1 0 0 0 1 1 0 1 0 1 1 0 0 10 0 1 1 1 1 1 0 1 0 1 0 0i 11 I I 1 I I I I l 1 I i1 A C 3 E 4Processor Instructions 443