Glossary: V

This page contains glossary terms beginning with the letter V.
!-9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Word or Term Description or Explanation
V22 CCITT standard for modem communications at 1200 bps
V22bis CCITT standard for modem communications at 2400 bps
V32 CCITT standard for modem communications at 9600 and 4800 bps
V32bis CCITT standard for modem communications at 14.4K, 12K, 2400, 9600 7200 and 4800 bps
V34 28.8 kilobits/second
V36 33.6 kilobits/second
V42 CCITT standard for modem communications that incorporates MNP levels 2-4 error correction and MNP level 5 data compression
V42bis CCITT standard for modem communications implementing data compression over V42 links
V90 56 kilobits/second
Vapourware a derogatory term for software that is being advertised but isn't actually available - it is often said to be available "real soon now"!
VDU Visual Display Unit - the monitor or television used to display the output of the computer
Vector graphics it is possible to represent a picture on a computer by using a series of lines, shapes, characters etc. - when such pictures are printed, the resolution of the pictures produced is only limited by the resolution of the output device (this contrasts with Bit-mapped graphics - for example, the Draw application produces vector graphics whereas Paint produces bit-mapped graphics)
Veronica Very Easy Rodent-Oriented Netwide Index to Computerised Archives - a system available on certain gopher sites for searching by keyword for files in gopher sites around the Internet
VESA Video Electronics Standards Association
VGA Video Graphics Adaptor or array - an early and relatively low resolution screen display: 640 × 480 pixels in at least 256 colours - in Acorn-speak: Mode 28
vi the original "VIsual mode" text editor for Unix, evolved from the 'ed' line editor - still the default, and still popular
VIDC20 VIDeo Controller - the video and audio controller designed by ARM Ltd and used in the RiscPC
Virtual memory a method by which an application, which requires more RAM memory than a computer actually has, can still operate - it is done by using parts of a hard drive's memory as an extension of the real memory, the information being swapped in and out by the operating system, as and when it needs to be accessed by the application
Virus a computer program which can replicate itself (unbeknown to the user) in various storage devices and in several places on one storage device - as discs are taken from one computer to another, the virus can be spread to more and more computers - often, the effect of these programs is to cause malicious damage to data within the computer system
VLSI Very Large Scale Integration - refers to integrated circuits with a high packing density of components
VLSI Ltd a silicon fabrication company that has, for many years, been licensed to fabricate ARM chips and associated I/O devices
VPoP Virtual PoP - new style PoP - although only to a local phone number all Demon VPoPs connect you through to the Finchley HQ using lines provided by a company called Energis - thus Demon only need to upgrade the facilities in Finchley for everyone to get the benefit
VRAM Video RAM (sometimes called Dual Port RAM) - this is a bank of high speed RAM used to store the information for the screen display - it can usually (as in the RiscPC) be accessed by the computer's processor and by the video controller at the same time - the computer accesses it as necessary to change the screen display and the video controller accesses it on a continuous basis to constantly generate the signals the monitor needs to display the information set up by the computer
VT100 terminal-emulation system - supported by many communications program, it is the most common one in use on the Net - VT102 is a newer version - also available are VT52, 220 and 320

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