Flow Charting and Block Diagramming Techniques - All about the ...

The same symbol is also used to represent otherkey-driven devices such as the Cardatype®, TypewriterCard Punch, and Typewriter Tape Punch.The SORTER and COLLATOR (a) symbol, representingoperations of machine types 82, 83, 85, 87, 88, 101and 108, may have one or more card files leading tothe operation symbol and one or more card files leavingthe symbol, depending on the type of operationbeing performed.The ACCOUNTING MACHINE (t) symbol is usually associatedwith a Report symbol (Figure 3) illustratingthe result of the operation. One of the examplesin Figure 9 shows how printing with summary punchingis illustrated.The AUXILIARY MACHINE (b) symbol is used to representoperations performed on reproducing andsummary punches, interpreters, calculators, facsimileposting machines, and tape-to-card and card-to-tapepunches.In Figure 9 it should be noted that documents producedas a result of an operation have a line leadingto them but no arrow. This is done to indicate thatthe symbol does not represent a separate job stepbut is associated with the symbol to which it is connected.The line leading from the document to thenext job step in which it is involved does have anarrow.Data Processing System SymbolsThe symbols in Figure 10 are used in flow chartingto illustrate data processing system operations. Thelarge number of machine components of a dataprocessing system requires a somewhat different typeof symbolism from that used with unit record machines.In this case the rectangle labeled CENTRALPROCESSING UNIT (c) in Figure 10 is used to representthe basic system components. This is assumed to includethe main storage facilities, the arithmetic unit,CentralProcessingUnitAuxiliaryMachine(Off-Line)Input/Outpui\,ControlAuxiliaryDrumStorageInquiryAuxi I iary StationDisk StorageCard Reader orCard PunchPaper TapeReader or Punch PrinterTypewriterFigure 10. Data Processing System Symbols11