University of Utah 1 IBM “business machines” -punch cards -electromechanical calculators slow introduction of electronic machines

University of Utah 2 IBM 701 “Electronic Data Processing Machine”

University of Utah 3 IBM multiplications per second Plastic tape, not metal

University of Utah 4 Memory Williams Tube -CRT for memory, not pictures! bits

University of Utah 5 IBM 701 Marketing election prediction -English/Russian translation 19 systems installed!

University of Utah 6 Sell or rent? IBM rented, not sold, their computers UNIVAC sold, not rented. Advantages? Disadvantages?

University of Utah 7 ERA Engineering Research Associates -Spinoff from Navy -Build drum memory

University of Utah 8 ERA Navy “Task 13” Commercial “Model 1101”

University of Utah 9 ERA Ran out of money Bought out by Remington Rand -same people who bought UNIVAC! -Marketed 1103 for science -UNIVAC for business conflict of interest?

University of Utah Drum memory Durable but slow -(picture on page 39)

University of Utah CRC Computer Research Company -“102A computer” Bought out by NCR

University of Utah Notice a Pattern? 1.New company experiments with new technology 2.Runs out of money 3.Bought by established company as easy path to new business This is not a new phenomenon!

University of Utah LGP-30 Librascope/General Precision -famous drum computer -cheap ($30,000) -small (desk-size)

University of Utah Flexowriter Only I/O device for many computers

University of Utah Bendix G-15 Another drum-based computer Fast but difficult to program

University of Utah IBM 650 IBM's drum machine 1000 installed! Discount price for universities

University of Utah IBM 650

University of Utah Computer sales BINAC: 1 UNIVAC: 46 IBM 701: 19 LGP-30: 400 Bendix G-15: 400 IBM 650: 1000

University of Utah How do you write a (non-infinite) loop without a break condition?

University of Utah Reminders and 1 Announcement Enigma homework due tonight at 7:30pm ENIAC assignment due next Friday! No school on Monday

University of Utah “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!)