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Unformatted text preview: Chapter 1 Notes 1.8 Technical Drawing Tools • Tools are used to produce 3 basic types of drawings: Freehand sketches Instrument drawings Computer drawings and models • Tools have evolved from pencils, triangles, scales, and compasses to computer aided design/drafting (CAD) systems. CAD is a computer software related computer hardware that supplements or replaces traditional hand tools in creating models and technical drawings. 1.9 Computer-Aided Drawing Tools • Hardware – the physical devices used to support the CAD 1.9.1 The Central Processing Unit (CPU) • Central processing unit (CPU) – the hardware device that runs the computer programs and controls the various attached input and output devices 1.9.2 Computer Operating System • Operating system – a software program that controls the internal operations of the compute, such as the memory, storage drives, input and output devices, and data transmission circuitry. • Software – the written and coded instructions that govern the operation of the computer and the functions it performs 1.9.3 Display Devices • Display device – a type of output device, that is, a device through which information flows from the computer “out” to the user • Classified by their type, resolution, size, and color capabilities Two types: 1. Vector device – locates the endpoints of a line and then draws the line by electronically charging a continuous stream of phosphors on the screen 2. Raster device – (the most common) creates an image by electronically charging individual points called pixels Pixels – arranged in horizontal rows...
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- Fall '07
- Chemistry, Input device, Output devices, disk drives, output device, technical drawings