Supporting I/O Devices‐Chapter #10Amy Hissom Key Terms 3-D RAM — Special video RAM designed to improve 3-D graphics simulation. active matrix — A type of video display that amplifies the signal at every intersection in the grid of electrodes, which enhances the pixel quality over that of a dual-scan passive matrix display. bandwidth — In relation to analog communication, the range of frequencies that a communications channel or cable can carry. In general use, the term refers to the volume of data that can travel on a bus or over a cable stated in bits per second (bps), kilobits per second (Kbps), or megabits per second (Mbps). Also called data throughput or line speed. bus mouse — A mouse that plugs into a bus adapter card and has a round, 9-pin mini-DIN connector. chip creep — A condition in which chips loosen because of thermal changes. DCE (Data Communications Equipment) — The hardware, usually a dial-up modem, that provides the connection between a data terminal and a communications line. See also DTE. dot pitch — The distance between the dots that the electronic beam hits on a monitor screen. DTE (Data Terminal Equipment) — Both the computer and a remote terminal or other computer to which it is attached. See also DCE. dual-scan passive matrix — A type of video display that is less expensive than an active-matrix display and does not provide as high-quality an image. With dual-scan display, two columns of electrodes are activated at the same time. ECP (Extended Capabilities Port) — A bidirectional parallel port mode that uses a DMA channel to speed up data flow. EPP (Enhanced Parallel Port) — A parallel port that allows data to flow in both directions (bidirectional port) and is faster than original parallel ports on PCs that allowed communication only in one direction. FireWire — See IEEE 1394. flat panel monitor — A desktop monitor that uses an LCD panel graphics accelerator — A type of video card that has an on-board processor that can substantially increase speed and boost graphical and video performance. Graphics DDR (G-DDR) — type of video memory Graphics DDR2 (G-DDR2) —type of video memory
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