bus1    Audio Help   /bʌs/ Pronunciation Key - Show Spelled Pronunciation[buhs] Pronunciation Key - Show IPA Pronunciation noun, plural bus·es, bus·ses, verb, bused or bussed, bus·ing or bus·sing.

–noun

1.	a large motor vehicle, having a long body, equipped with seats or benches for passengers, usually operating as part of a scheduled service; omnibus.

2.	a similar horse-drawn vehicle.

3.	a passenger automobile or airplane used in a manner resembling that of a bus.

4.	any vehicle operated to transport children to school.

5.	a low, movable filing cabinet.

6.

Electricity. Also called bus bar, bus·bar    Audio Help   /ˈbʌsˌbɑr/ Pronunciation Key - Show Spelled Pronunciation[buhs-bahr] Pronunciation Key - Show IPA Pronunciation. a heavy conductor, often made of copper in the shape of a bar, used to collect, carry, and distribute powerful electric currents, as those produced by generators.

7.	Computers. a circuit that connects the CPU with other devices in a computer.

–verb (used with object)

8.	to convey or transport by bus: to bus the tourists to another hotel.

9.	to transport (pupils) to school by bus, esp. as a means of achieving racial integration.

–verb (used without object)

10.	to travel on or by means of a bus: We bused to New York on a theater trip.

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[Origin: 1825–35; short for omnibus; (def. 6) short for omnibus bar]

bus2    Audio Help   /bʌs/ Pronunciation Key - Show Spelled Pronunciation[buhs] Pronunciation Key - Show IPA Pronunciation

–verb (used without object), verb (used with object), bused or bussed, bus·ing or bus·sing.

to work or act as a busboy or busgirl: She bused for her meals during her student days.

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[Origin: 1830–40; back formation from busboy]

Mos·bach·er    Audio Help   /ˈmɔsbækər, ˈmɒs-/ Pronunciation Key - Show Spelled Pronunciation[maws-bak-er, mos-] Pronunciation Key - Show IPA Pronunciation

–noun

Emil, Jr. (“Bus”), 1922–1997, U.S. yacht racer and government official.

bus architecture
One of the sets of conductors (wires, PCB tracks or connections in an integrated circuit) connecting the various functional units in a computer. There are busses both within the CPU and connecting it to external memory and peripheral devices. The data bus, address bus and control signals, despite their names, really constitute a single bus since each is useless without the others.
The width of the data bus, i.e. the number of parallel connectors, and its clock rate determine its data rate (the number of bytes per second which it can carry). This is one of the factors limiting a computer's performance. Most current microprocessors have 32-bit busses both internally and externally. 100 or 133 megahertz bus clock rates are common. The bus clock is typically slower than the processor clock.
Some processors have internal busses which are wider than their external busses (usually twice the width) since the width of the internal bus affects the speed of all operations and has less effect on the overall system cost than the width of the external bus.
Various bus designs have been used in the PC, including ISA, EISA, Micro Channel, VL-bus and PCI. Other peripheral busses are NuBus, TURBOchannel, VMEbus, MULTIBUS and STD bus.
Some networks are implemented as a bus at the physical layer, e.g. Ethernet - a one-bit bus operating at 10 (or later 100) megabits per second.
The term is almost certainly derived from the electrical engineering term "bus bar" - a substantial, rigid power supply conductor to which several connections are made. This was once written "'bus bar" as it was a contraction of "omnibus bar" - a connection bar "for all", by analogy with the passenger omnibus - a conveyance "for all".
More on derivation.
(2000-03-20)

Bus

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