11.07.2015 Views

Program Logic Manual - All about the IBM 1130 Computing System

Program Logic Manual - All about the IBM 1130 Computing System

Program Logic Manual - All about the IBM 1130 Computing System

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Register status:MainlineSaved at/restored fromsymbolic locationACC EXT XR1 XR2 XR3 StatusCD120Used X XInterruptlevel 0Interruptlevel 4Saved at/restored fromsymbolic location CD190 CD190+1 CD018UsedSaved at/restored fromsymbolic locationXUsed X X X X XSignificant variables:Symbolic locationContents/UseCD210CD250CD260CD230CD188$LAST$CTSW$IBSYFirst column indicator.Current column address.Second half of <strong>the</strong> last IOCC performed, read or punch.Second half of <strong>the</strong> last IOCC performed, start read or punch.Skip indicator; non-zero = take one feed cycle.Last card indicator; non-zero = last card.Control card switch; non-zero = control card read.Busy indicator for 1442; non-zero = busy.<strong>Program</strong> Analysis Procedures 127

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