PLS 21 Lecture Notes - Lecture 11: Square Number, Impedance Matching, Integrated Development Environment

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31 May 2017
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PLS 21 Full Course Notes
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The computer communicates w various input/output devices through ports. The 104 key pc us english keyboard layout evolved from standard typewriter keyboard (1860s) Extra keys added that are specific to computing. Qwerty designed to keep ppl from typing too fast bc printer would jam. Kept the design after they managed to fix problem bc would be too expensive to change. Buffer= a region of memory used to temporarily hold data while it is being moved from one place to another. Steve jobs visited center before apple adopted the gui interface. 1984 apple introduced the apple macintosh computer w innovative gui to the mac os. 1st mouse that was integrated part of comp and intended for personal computer navigation came w the xerox 8010 star info system 1981. Most standard features= two buttons and scroll wheel. Motion sensing part of mouse can be mechanical or optical: mechanical mouse. X and y rollers grip the bal to transfer movement to disks.

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