CSC 005 Lecture Notes - Lecture 1: Machine Code, Packet Switching, Arpanet
14 Feb 2017
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Ex: programs that tell the computer what to do. Share information and resources ex: internet. Interacts with computer system and manages hardware and data interactions. Physical stuff ex: gates, circuit boards, etc. Ex: driving without knowing what goes on inside the car. Info hiding: isolation makes program easier to understand. Built/sold gear-driven machines that performed addition and subtraction. Built first machine to do all mathematical equations. Cards with holes in them specified the colored thread. Built analytical machine: wasn"t implemented; too ahead of his time. Created the loop had instructions on repeat. 1st electro-mechanical tabulator: read info from punched card. Ibm calculator given to harvard harvard mark i. Rotated under read/write head: date written to/read from that place. Each data item accessed directly by location on disk address. Moore"s law: # of circuits replaced on single ic doubles. Without, information went away when turned off. Rely on interconnected cp/memory units that increase processing speed.
