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 locationPR140PRO80PRO80+1PR110PR300PR300+1PRO90PRO90+1PR290+1PRO60PR070PR110PR39.0Contents/UseA NOP after <strong>the</strong> following areas have been adjusted to <strong>the</strong> correct address as aresult of relocation:PR300PR500+1PR180+2PR280+2PR170+1PR220+2PRO80PR400+1PR430+1First word of Print IOCC, contains address of print buffer.Second half of Print IOCC.Second half of Sense-without-reset IOCC,First word of Skip-to-channel-12 IOCC.Second word of Skip-to-channel-12 IOCC.First word of Space immediate IOCC.Second word of Space immediate IOCC.Address of <strong>the</strong> user's I/O area.Storage location for <strong>the</strong> last DSW sensed during interrupt; also, first word ofSense-DSW-with-reset IOCC.Second word of Sense-DSW-with-reset IOCC.Second word of Sense-DSW-without-reset IOCC.60-word buffer from which <strong>the</strong> line is printed.$PGCT Binary page count, where 0 page count 32767$CH12$PBSYChannel 12 switch indicating channel 12 detected in DSW during interrupt;not reset until a skip to channel 1 is requested by <strong>the</strong> user.Printer busy switch, modified during execution of routine.($PBSY) = Zero: routine and printer not busy.= Positive: transmission to printer is in progress; transmissioncomplete has not been received; subroutine I/O buffer is busy.= Negative: transmission complete has been received; subroutineI/O buffer can now be set up with new message.<strong>Program</strong> Analysis Procedures 135

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