Introduction to data processing: mainframes, minis, and microcomputers
A valuable review and study aid for high school and college students or anyone who needs to brush up on DP basics before going on to more complex subjects. Explains what data processing is, how a data processing system is designed and the types of equipment used. Illustrates the ways in which computers store, process and retrieve vast quantities of data. Outlines the major steps in writing a computer program, providing easy-to-follow exercises that let readers practice drawing flowcharts to specify data processing tasks. The Third Edition has been revised and updated to reflect the use of mini- and microcomputers in business, industry, and education.
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AN OVERVIEW OF COMPUTER SYSTEMS
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absolute machine language account number amounts of data analyst arithmetic-logic unit auxiliary storage BASIC binary number binary-coded decimal byte calculations called central processing unit Chapter characters COBOL column compiler computer system control unit convert data at address data processing cycle debugging decimal number Describe designed digit disk drive disk pack display terminal EBCDIC efficiency error example floppy disk flowchart FORTRAN frame hard disk hexadecimal input and output input data input-output device instructions intelligent terminal large number laser printer last record light pen magnetic disk magnetic tape mainframe mainframe computers Match the following microcomputers object program operating system output devices parity bit perform personal computers piece of data shown in Figure shows source document source program statements is true step 20 stored subtraction symbolic language systems analysis telecommunications tell the computer three numbers universal product code write written