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Words starting with altbi

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  • alta vista — (web)   A website provided by Digital which features a very fast Web and Usenet search engine. As of April 1996 its word index is 33GB in size. AltaVista is currently (June 1996) the largest Web index, with 30 million pages from 225,000 servers, and three million articles from 14,000 Usenet news groups. It is accessed over 12 million times per weekday.
  • altair 8800 — (computer)   An Intel 8080-based machine made by MITS. The Altair was the first popular microcomputer kit. It appeared on the cover of the January 1975 "Popular Electronics" magazine with an article (probably) by Leslie Solomon. Leslie Solomon was an editor at Popular Electronics who had a knack for spotting kits that would interest people and make them buy the magazine. The Altair 8800 was one such. The MITS guys took the prototype Altair to New York to show Solomon, but couldn't get it to work after the flight. Nonetheless, he liked it, and it appeared on the cover as "The first minicomputer in a kit." Solomon's blessing was important enough that some MITS competitors named their product the "SOL" to gain his favour. Some wags suggested SOL was actually an abbreviation for the condition in which kit purchasers would find themselves. The original Altair BASIC ran in less than 4K of RAM because a "loaded" Altair had 4K memory. Since there was no operating system on the Altair, Altair BASIC included what we now think of as BIOS. It was distributed on paper tape that could be read on a Teletype. Later versions supported the 8K Altair and the 16K diskette-based Altair (demonstrating that, even in the 1970s, Microsoft was committed to software bloat). Altair BASIC was ported to the Motorola 6800 for the Altair 680 machine, and to other 8080-based microcomputers produced by MITS' competitors.
  • alternating bit protocol — (networking)   (ABP) A simple data link layer protocol that retransmits lost or corrupted messages. Messages are sent from transmitter A to receiver B. Assume that the channel from A to B is initialised and that there are no messages in transit. Each message contains a data part, a checksum, and a one-bit sequence number, i.e. a value that is 0 or 1. When A sends a message, it sends it continuously, with the same sequence number, until it receives an acknowledgment (ACK) from B that contains the same sequence number. When that happens, A complements (flips) the sequence number and starts transmitting the next message. When B receives a message from A, it checks the checksum. If the message is not corrupted B sends back an ACK with the same sequence number. If it is the first message with that sequence number then it is sent for processing. Subsequent messages with the same sequence bit are simply acknowledged. If the message is corrupted B sends back an negative/error acknowledgment (NAK). This is optional, as A will continue transmitting until it receives the correct ACK. A treats corrupted ACK messages, and NAK messages in the same way. The simplest behaviour is to ignore them all and continue transmitting.
  • alt — (esp of vocal music) high in pitch
  • alt key — either of two keys on a PC keyboard that is held down while pressing another key, as to perform a specific operation or type a special character.
  • alt-right — (in the US) a political movement whose supporters hold extreme right-wing views and reject mainstream politics
  • alt-rock — a genre of rock music regarded by its practitioners and fans as being outside the mainstream
  • alt. — (law) Abbreviation of alternative.