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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Significant variables:Symbolic locationPT000+1PT010+1PT060PT340PT360PT370PT380PT460 and PT460+1PT480PT500Contents/UseReturn address to caller from main line.Return address from interrupt.Function code, executed as follows:/7000 = MDX */7001 = MDX *+1/7002 = MDC *+2Data area pointer.Remaining word count.Switch used for reading or punching: /0001 = punch, /0002 = read.Switch used to indicate if conversion of information read is needed:zero = no conversion,non-zero = conversion.IOCC for read and punch.Data buffer. The character to be read or punched is contained here.Counter for counting first 3 characters.<strong>Program</strong> Analysis Procedures 137

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