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Unibus, the Glossary

Index Unibus

The Unibus was the earliest of several computer bus and backplane designs used with PDP-11 and early VAX systems manufactured by the Digital Equipment Corporation (DEC) of Maynard, Massachusetts.[1]

Table of Contents

  1. 27 relations: Asynchronous circuit, Backplane, Bus (computing), Carnegie Mellon University, Central processing unit, Computer data storage, Device driver, Digital Equipment Corporation, Direct memory access, Edge connector, Electrical termination, Expansion card, Gordon Bell, Massachusetts, Massbus, Maynard, Massachusetts, Memory-mapped I/O and port-mapped I/O, Multiplexing, PDP-11, Peripheral bus, Printed circuit board, Pull-up resistor, Q-Bus, Repeater, System bus, VAX, Wired logic connection.

  2. DEC hardware
  3. PDP-11

Asynchronous circuit

Asynchronous circuit (clockless or self-timed circuit) is a sequential digital logic circuit that does not use a global clock circuit or signal generator to synchronize its components.

See Unibus and Asynchronous circuit

Backplane

A backplane or backplane system is a group of electrical connectors in parallel with each other, so that each pin of each connector is linked to the same relative pin of all the other connectors, forming a computer bus. Unibus and backplane are computer buses.

See Unibus and Backplane

Bus (computing)

In computer architecture, a bus (historically also called data highway or databus) is a communication system that transfers data between components inside a computer, or between computers. Unibus and bus (computing) are computer buses.

See Unibus and Bus (computing)

Carnegie Mellon University

Carnegie Mellon University (CMU) is a private research university in Pittsburgh, Pennsylvania.

See Unibus and Carnegie Mellon University

Central processing unit

A central processing unit (CPU), also called a central processor, main processor, or just processor, is the most important processor in a given computer.

See Unibus and Central processing unit

Computer data storage

Computer data storage or digital data storage is a technology consisting of computer components and recording media that are used to retain digital data.

See Unibus and Computer data storage

Device driver

In the context of an operating system, a device driver is a computer program that operates or controls a particular type of device that is attached to a computer or automaton.

See Unibus and Device driver

Digital Equipment Corporation

Digital Equipment Corporation (DEC), using the trademark Digital, was a major American company in the computer industry from the 1960s to the 1990s.

See Unibus and Digital Equipment Corporation

Direct memory access

Direct memory access (DMA) is a feature of computer systems that allows certain hardware subsystems to access main system memory independently of the central processing unit (CPU).

See Unibus and Direct memory access

Edge connector

An edge connector is the portion of a printed circuit board (PCB) consisting of traces leading to the edge of the board that are intended to plug into a matching socket.

See Unibus and Edge connector

Electrical termination

In electronics, electrical termination is the practice of ending a transmission line with a device that matches the characteristic impedance of the line.

See Unibus and Electrical termination

Expansion card

In computing, an expansion card (also called an expansion board, adapter card, peripheral card or accessory card) is a printed circuit board that can be inserted into an electrical connector, or expansion slot (also referred to as a bus slot) on a computer's motherboard (see also backplane) to add functionality to a computer system. Unibus and expansion card are computer buses.

See Unibus and Expansion card

Gordon Bell

Chester Gordon Bell (August 19, 1934 – May 17, 2024) was an American electrical engineer and manager.

See Unibus and Gordon Bell

Massachusetts

Massachusetts (script), officially the Commonwealth of Massachusetts, is a state in the New England region of the Northeastern United States.

See Unibus and Massachusetts

Massbus

The Massbus is a high-performance computer input/output bus designed in the 1970s by Digital Equipment Corporation (DEC). Unibus and Massbus are computer buses and DEC hardware.

See Unibus and Massbus

Maynard, Massachusetts

Maynard is a town in Middlesex County, Massachusetts, United States.

See Unibus and Maynard, Massachusetts

Memory-mapped I/O and port-mapped I/O

Memory-mapped I/O (MMIO) and port-mapped I/O (PMIO) are two complementary methods of performing input/output (I/O) between the central processing unit (CPU) and peripheral devices in a computer (often mediating access via chipset).

See Unibus and Memory-mapped I/O and port-mapped I/O

Multiplexing

In telecommunications and computer networking, multiplexing (sometimes contracted to muxing) is a method by which multiple analog or digital signals are combined into one signal over a shared medium.

See Unibus and Multiplexing

PDP-11

The PDP–11 is a series of 16-bit minicomputers sold by Digital Equipment Corporation (DEC) from 1970 into the late 1990s, one of a set of products in the Programmed Data Processor (PDP) series.

See Unibus and PDP-11

Peripheral bus

In computing, a peripheral bus is a computer bus designed to support computer peripherals like printers and hard drives. Unibus and peripheral bus are computer buses.

See Unibus and Peripheral bus

Printed circuit board

A printed circuit board (PCB), also called printed wiring board (PWB), is a medium used to connect or "wire" components to one another in a circuit.

See Unibus and Printed circuit board

Pull-up resistor

In electronic logic circuits, a pull-up resistor (PU) or pull-down resistor (PD) is a resistor used to ensure a known state for a signal.

See Unibus and Pull-up resistor

Q-Bus

The Q-bus, also known as the LSI-11 Bus, is one of several bus technologies used with PDP and MicroVAX computer systems previously manufactured by the Digital Equipment Corporation of Maynard, Massachusetts. Unibus and q-Bus are computer buses and DEC hardware.

See Unibus and Q-Bus

Repeater

In telecommunications, a repeater is an electronic device that receives a signal and retransmits it.

See Unibus and Repeater

System bus

A system bus is a single computer bus that connects the major components of a computer system, combining the functions of a data bus to carry information, an address bus to determine where it should be sent or read from, and a control bus to determine its operation. Unibus and system bus are computer buses.

See Unibus and System bus

VAX

VAX (an acronym for Virtual Address eXtension) is a series of computers featuring a 32-bit instruction set architecture (ISA) and virtual memory that was developed and sold by Digital Equipment Corporation (DEC) in the late 20th century.

See Unibus and VAX

Wired logic connection

A wired logic connection is a logic gate that implements boolean algebra (logic) using only passive components such as diodes and resistors.

See Unibus and Wired logic connection

See also

DEC hardware

PDP-11

References

[1] https://en.wikipedia.org/wiki/Unibus