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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 locationContents/UseRP500RP520RP600RP200$LAST$CTSWSIB SYCurrent column address.I/O address for restart information.Word count for 2501 Reader.Device last used:/1702 = 1442/4F01 = 2501Last card indicator; non-zero = last card.Control card switch; non-zero = control card read.Busy indicator; non-zero = busy.<strong>Program</strong> Analysis Procedures 129

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