Q-Bus

The Q-bus (also known as the LSI-11 Bus) was one of several bus technologies used with PDP and MicroVAX computer systems manufactured by the Digital Equipment Corporation of Maynard, Massachusetts.

The Q-bus was a less expensive version of Unibus using multiplexing so that address and data signals shared the same wires. This allowed both a physically smaller and less-expensive implementation of essentially the same functionality.

Over time, the physical address range of the Q-bus was expanded from 16 to 18 and then 22 bits. Block transfer modes were also added to the Q-bus.

Main features of the Q-bus

Like the Unibus before it, the Q-bus used:

Memory-mapped I/O

Byte addressing

A strict master-slave relationship between devices on the bus

Asynchronous signaling

Memory-mapped I/O means that data cycles between any two devices, whether CPU, memory, or I/O devices, used the same protocols. On the Unibus, a range of physical addresses were dedicated for I/O devices. The Q-bus simplified this design by providing a specific signal (originally called BBS7, Bus Bank Select 7 but later generalized to be called BBSIO, Bus Bank Select I/O) that selected the range of addresses used by the I/O devices.

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List of bus routes in Queens

The Metropolitan Transportation Authority (MTA) operates a number of bus routes in Queens, New York, United States, under two different public brands. Some of them are the direct descendants of streetcar lines (see list of streetcar lines in Queens).

List of routes

This table gives details for the routes prefixed with "Q"—in other words, those considered to run primarily in Queens by the MTA. For details on routes with other prefixes, see the following articles:

List of bus routes in Brooklyn: B13, B15, B20, B24, B26, B32, B38, B52, B54, B57, B62

List of bus routes in Manhattan: M60

List of bus routes in Nassau County, New York: n1, n4, n4X, n6, n6X, n20G, n22, n22A, n22X, n24, n26, n31, n32, n33

List of express bus routes in New York City: X63, X64, X68, BM5, QM1, QM2, QM3, QM4, QM5, QM6, QM7, QM8, QM10, QM11, QM12, QM15, QM16, QM17, QM18, QM20, QM21, QM24, QM25

Each route is marked with the operator. Routes marked with an asterisk (*) run 24 hours a day. The full route is shown except for branching.

This page contains text from Wikipedia, the Free Encyclopedia - https://wn.com/List_of_bus_routes_in_Queens

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