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Unformatted text preview: Jelena Mamčenko Operating Systems Lecture Notes on Operating Systems 20 A mouse is a handheld pointing device for computers, being a small object fitted with one or more buttons and shaped to sit naturally under the hand. The underside of the mouse houses a device that detects the mouse's motion relative to the flat surface on which it moves. The mouse's 2D motion is typically translated into the motion of a pointer on the display. It is called a mouse primarily because the cord on early models resembled the rodent's tail, and also because the motion of the pointer on the screen can be mouse-like (Fig. 2). 16 Main memory A PC's main memory place (or primary storage) is fast storage space that is directly accessible by the CPU. It is generally used for storing relatively short-term data needed for software execution. Main memory is usually much faster than mass storage devices like hard disks or optical discs, but usually cannot retain data for more than a few fractions of a second without power and is...
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This note was uploaded on 12/29/2011 for the course CSE 362 taught by Professor Mavin during the Spring '09 term at SUNY Stony Brook.
- Spring '09
- Operating Systems