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accounts receivable amount applications billing binary block bytes card punch card reader card system Chapter characters chart COBOL column computer system cost count-key-data customer number cylinder data-processing decimal deck digit direct-access device direct-access system disk pack documents EBCDIC error example executed field file organization FORTRAN illustrate indicate input instruction invoice item number job-control cards keypunch language ledger card machine master file master record minicomputer modular program module multiprogramming open-item operating system output payroll percent PL/I printed printer problem procedures processing punched card real-time system reorder result rotational delay routines sector sequence sequential file shipping order shown in Figure sorted specific speed step storage positions stored structure chart structured programming subroutine symbol system design system flowchart System/3 SYSTEMS ANALYSIS tape drive terminal time-sharing tion topic track transaction cards typical update writing