ITM 301 Lecture Notes - Dartmouth Time Sharing System, Punched Card, Eniac

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Itm 301 week 1: it infrastructure a brief history. 3 main components: computing, main component, telecommunication, security. Huge computer: 30-ton, 49 ft high cabinets, 18000 vacuum tubes, 1500 relays, 70 000 resistors, 10000 capacitors, 6000 manual switches, consumed 200 kilowatts. Capable of 5000 additions, 357 multiplications, or 38 divisions per second. Problems that took a human mathematician 20 hours to solve, only took 30 seconds for eniac. Punch cards used to punch lines of codes: execute and print results. Batched jobs and delivered results later: not able to server users interactively. Running a job or task: manually typing programming instructions into a punch card, feeding the card into the computer through a card-reader, which would then process the program and data, printing out the results. Able to run only one program at the time. Professors john g. kemeny and thomas e. kurtz. Multiprogramming: computer running more than one program at a time.

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