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

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

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Load Immediate (PLI)0 5 8 15Op code0 1 1 0 01 I 1X X X1 I 1Displacement1 1 1 1 1 I6 0-7 X XThe contents of <strong>the</strong> displacement field of <strong>the</strong> instruction (bits 8 to 15) replace <strong>the</strong>contents of <strong>the</strong> register specified by <strong>the</strong> R field. An R field of 000 means that <strong>the</strong>displacement is loaded into <strong>the</strong> accumulator; a nonzero R field means that <strong>the</strong> displacementis loaded into one of <strong>the</strong> index registers. Before loading, <strong>the</strong> 8-bit displacement fieldis expanded to 16 bits by propagating <strong>the</strong> displacement sign-bit (bit 8) value through<strong>the</strong> high-order bits (that is, bits 0 to 7 take on <strong>the</strong> value of <strong>the</strong> sign bit). Theinstruction word is not changed.The carry and overflow indicators are not changed. The result indicators are changedto reflect <strong>the</strong> final contents of <strong>the</strong> accumulator or index register.Example:0 Before PLI operationPLI instruction0 15Op codeO 1 1 00III 1O 0 0I IDisplacement1 1 0 1 1 0 1 1111111i6 0 D BAccumulator0 15XXXXXXXXXXXXXXXXI II IIIIIIIIIIII,■•■•■,./.1•No'0 After PLI operationPLI instruction0Accumulator15 0 15Op codeO 1 1 010II 1 1O 0 0I 1Displacement1 1 0 1 1 0 1 1I 1 1 1 I 1 i1 1 1 1 1 1 1 1 1 1 1 1 0 1 1 1 0 1 111 1 1 1 1 1( 1 1 1 1 1 1 16 0 D B F F D B1111 11/11111111111■1111 MI111114 IFNI IOU Ill.i ii IIIII1 gull!

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