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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 locationW3920W3935W3990Contents/UseFirst word of <strong>the</strong> Sense-DSW-without-reset IOCC; also, Carriage controlcharacter.Routine busy switch, non-zero indicates <strong>the</strong> routine is processing a message.First word of 60-word output buffer.W3975DSW saved for checking of indicator bits at appropriate time; error bitsduring print complete ,ch. 9/12 during carriage operation complete.W3130+1 Address of user output area.• <strong>Program</strong> Analysis Procedures 167

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