TEST ONE - TEST ONE V369-MANAGING I N FOR MAT ION TEC...

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Unformatted text preview: TEST ONE V369-MANAGING I N FOR MAT ION TEC HNOLOGIES Second generation computer language:-know examples of…/ what it is vs. other generations First Generation: Vacuum Tubes; Magnetic Drum Memories (1946-1959) Second Generation: Transistors; Magnetic Core Memories (1959-1964) Third Generation: Integrated Circuits, Semiconductor Memories, Operating System (64-late 70s) Fourth Generation: Large Scale Integration (LSI) and Very Large Scale Integration Circuits (VLSI) ; Communication between computers; multiple processors in a single machine (1980s-present) • Machine language (1GL) –Each instruction must be expressed in unique form for a particular computer –Complete program consists of thousands of instructions –Programming is a tedious, time-consuming process • Assembly languages (2GL) –Easily remembered mnemonic operation codes substituted for machine language operation codes –Assembler used to convert mnemonic codes to machine language • Procedural languages (3GL) –Typically machine independent –Express a step-by-step procedure devised by the programmer –Must be compiled or interpreted (translated into machine language) –Include FORTRAN, COBOL, BASIC, PL/1, PASCAL, ADA, and C • Nonprocedural languages (4GL) –Also referred to as productivity languages –Use more English-like statements for program instructions –Easier to use, write, and less error-prone –Use a built-in interpreter to convert to machine language –Take much longer to execute than 3GLs –Include FOCUS, CA-Ramis, IFPS, and SAS structured programming half duplex full duplex operating system main frames super computers ALU Control Unit : • Control unit and arithmetic/logical unit together known as the central processing unit (CPU) • Controls the other five components of the computer system • Used to take advantage of speed and capacity of other components • L ist of operations, called a program, tells the control unit what to do • These operations are read from memory, interpreted, and carried out one at a time (stored-program concept) What are advantages of Secondary Storage as compared to main memory Microwave –Line of sight • Widespread use for several decades • L ine of sight transmission • L imited to 25-50 mile distances because of curvature of the earth • Expensive, but less costly than fiber optic cables • T w isted Pair –Literally wires that are twisted to reduce interference –Can be shielded (STP) or unshielded (UTP), but the most commonly used is UTP –Commonly used in telephones and LANs –Wireless • Not strictly a transmission media, but rather a technology in which radio signals are sent through the air • There are many different wireless technologies such as cordless telephones and cellular telephones which are widely used in personal and business communications •We will consider the following wireless technologies in more detail: • Wireless LANs • M icrowave –Line of sight •Satellite –Long distances...
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This note was uploaded on 02/07/2011 for the course SPEA-V 369 taught by Professor T.c.bradely during the Spring '11 term at Indiana.

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TEST ONE - TEST ONE V369-MANAGING I N FOR MAT ION TEC...

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