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Program Logic Manual - All about the IBM 1130 Computing System

Program Logic Manual - All about the IBM 1130 Computing System

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Significant variables:Symbolic locationPZ340PZ340+1PZ360 andPZ360+1PZ400PZ400+1PZ120+1PZ040Contents/UseAddress pointer to I/O area; First word of Punch IOCC, Incremented oneach column interrupt.Second word of Punch IOCC.Feed IOCC for initiating punch operation.Error display indicator.Second word of last card feed IOCC.Original I/0 area address.Switch used for waiting for operation -- complete interrupt:zero = op complete interrupt has occurrednon-zero = waiting for op-complete<strong>Program</strong> Analysis Procedures 143

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