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

and the basic controls. To this are connected additionalsymbols representing peripheral componentsand the documents which they process. For example,a reel of magnetic tape indicates that a magnetictape unit is connected; a punched card with an arrowleading to the CPU indicates a card reader; a punchedcard with an arrow leading from the CPU, a cardpunch; and so on.In some applications the manner in which auxiliarystorage units are used (e.g., magnetic drum storageon a 705 system or magnetic disk storage on a 650system) is an important feature of the system. TheAUXILIARY DISK STORAGE and AUXILIARY DRUM STORAGE(m) symbols, connected to the central processing unitby a two-pointed arrow, provide a means of illustratingsuch features.For many data processing systems, the INPUT-OUTPUTCONTROLS (r) must be shown in order to depict clearlythe system's capabilities. A specific example is the IBM7070 with the 7604 Tape Control. The manner inwhich magnetic tape units are assigned to the twodata channels is a significant factor in the data processingprocedure in that processing time will dependpartly on the assignment. The same thing is true inthe case of the 705 III or 709 with two or more DataSynchronizers and the 705 I and II with two or moreTape Record Coordinators.With some other systems — a 705 II with 754 TapeControls, for example — the manner in which themagnetic tape units attach to the central processingunit has no obvious effect on the application approachor timing, hence the tape controls need not be shown.Figure 11 illustrates typical ways in which dataprocessing system operations are flow-charted. TheCentral Processing Unit symbol is sometimes labeledwith the type number to identify the system. Whenno confusion as to the system type can exist, the spacecan be used to identify the processing step.The illustrations in Figure 11 can represent any ofthe following system configurations:A. Card reader, card punch and printer providingdirect input and output to:1. an IBM 3052. an IBM 650 Data Processing System3. any IBM 700 series system4. an IBM 7070 Data Processing SystemB. Four magnetic tape units operating with:1. an IBM 650 Data Processing System2. an IBM 705 Data Processing System with oneor more 754 Tape Controls or one 777 Tape RecordCoordinator3. an IBM 705 III Data Processing System withone 767 Data Synchronizer4. an IBM 704 Data Processing System with 753Tape Civiitrvi5. an IBM 709 Data Processing System with one766 Data SynchronizerC. Four magnetic tape units, auxiliary drum storage,a card reader and a printer operating with:1. an IBM 705 Data Processing System with oneor more 754 Tape Controls or one 777 Tape RecordCoordinator2. an IBM 705 III Data Processing System withone 767 Data Synchronizer3. an IBM 704 Data Processing System with 753Tape Control4. an IBM 709 Data Processing System with one766 Data SynchronizerD. Five magnetic tape units operating with:1. an IBM 705 Data Processing System with two777 Tape Record Coordinators2. an IBM 705 III Data Processing System withtwo 767 Data Synchronizers3. an IBM 709 Data Processing System with two766 Data Synchronizers4. an IBM 7070 Data Processing System with7604 Tape Control5. an IBM 7090 Data Processing System withtwo 7607 Data ChannelsE. An IBM 7070 Data Processing System with 7604Tape Control, five 729 IV Magnetic Tape Units,four 729 II Magnetic Tape Units, 7300 DiskStorage, 7500 Card Reader, 7150 Console ControlUnit (typewriter) , 7400 Printer, 7550 CardPunch and 7900 Inquiry Station. (The remotelocation of the inquiry station is indicated bythe broken line.)13