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

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

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

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Example:0 5 8 15PAS instruction(located at address 256 decimal)Op code0 1 1 1 1IR0 0 01 1Displacement0 1 1 1 1 1 1 1 111117 8 7Storage wordIAR(EA = IAR + Disp)0 15 015PAS instructionis fetched(Decimal 257)0 0 0 0 10 0 0 1 ,0 0 0 0 1 0 0 0 11111111 i 11111111 1 1 1 11 1 1 1 11 1 1 1 1 1 1 1 1III i 111111111110 1 0 1 F F F FPAS instructionexecutionContents of storage word 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1Add one +0000 0000 0000 0001Result 0000 0000 0000 00000IAR15 0Storage word15After PASinstruction(Decimal 258)0 0 0 0 ,0 0 0 1 ,0 0 0 0,0 0 1 0.1 I 1 1 I 1 1 1 I ill0 1 0 20 0 0 0,0 0 0 0,0 0 0 0,0 0 0 0111111 / 111110 0 0 0The result-zero and result-even indicators are set on because of <strong>the</strong> 0 value. The PASinstruction tests <strong>the</strong> result-zero indicator, finds it on, and thus increments <strong>the</strong> IARby 1Upon completion of <strong>the</strong> PAS operation, <strong>the</strong> next instruction fetched and executed isat location 258. The instruction at location 257 is skipped.4-40 GA34-0003

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