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University of Utah 1 Fortran Assignment Due tonight @ 7:30pm Questions?
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University of Utah 2 Early 1960's Mainframe Companies Snow White (IBM) Seven Dwarfs -Control Data, Honeywell, Philco, Burroughs, RCA, GE, NCR
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University of Utah 3 IBM in 1961 7090/7094 -large scientific mainframe 1401 -small mainframe 7070 -“business” version of 7090 1620 -another small mainframe
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University of Utah 4 IBM in 1961 7090/7094 -large scientific mainframe 1401 -small mainframe 7070 -“business” version of 7090 1620 -another small mainframe ALL INCOMPATIBLE!
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University of Utah 5 SPREAD Committee at IBM (1961) -Current machines not scalable -What to do about it?
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University of Utah 6 The Answer One unified product line -for business AND science “Bet the company”
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University of Utah 7 System/360 A family of related machines -25:1 performance ratio All binary-compatible with each other!!! -Same executables run on each model of 360
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University of Utah 8 How? Microprogramming -Same instruction set -But implemented differently for each machine!
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University of Utah 9 Gallery
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University of Utah 10 10 Gallery
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University of Utah 11 11 Gallery
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University of Utah 12 12 Lasting trends System/360 used 8-bit “bytes” 32-bit word length General-purpose registers
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University of Utah 13 13 EBCDIC “Extended Binary Coded Decimal Interchange Code” Two standards -ASCII for minicomputers -EBCDIC for mainframes
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University of Utah 14 14 Emulators 360 included emulation modes for -7000-series -1401 Customers could migrate existing applications -Sorry, Honeywell!
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University of Utah 15 15 Operating Systems OS/360 -Too late! Stopgaps -BOS, TOS, DOS
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University of Utah 16 16 Famous People Gene Amdahl -“Amdahl's Law” -Principle designer of System/360
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University of Utah 17 17 Famous People Fred Brooks -“The Mythical Man-Month” Based on experiences writing OS/360
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University of Utah 18 18 Summary System/360 -extremely successful! -first “line” of computers -established many current conventions Direct ancestor of IBM's current mainframes!
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University of Utah 19 19 Next Homework
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University of Utah 20 20 Multimedia
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University of Utah 21 21 Friday Guest speaker: Lee Hollaar
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University of Utah 22 22 “Test Question” On a scrap of paper, write a question that encapsulates one of the points from today's class, and turn it in. (Put your name on it!)
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