Peripheral - Revision history

Jnc: +cat

2018-12-16T00:06:06Z

+cat

Jnc: clarify

2018-10-07T15:03:54Z

clarify

Jnc: Fix grammar

2018-08-21T00:20:49Z

Fix grammar

Jnc: Mention device/controller split

2018-08-20T13:40:06Z

Mention device/controller split

Jnc: Improve a bit

2018-06-14T12:49:36Z

Improve a bit

Jnc: Expand a tiny bit

2018-05-14T14:37:46Z

Expand a tiny bit

Jnc: A start

2018-03-28T18:38:11Z

A start

New page

A '''peripheral''' is a device attached to a computer to pass data in and out of the computer - either to [[secondary storage]] which is permanently accessible; some other form of data storage, intended for off-line storage; communication, either to users or other computers, etc.

Devices may use either [[programmed I/O]] or [[Direct Memory Access|DMA]] to get data in and out of the [[Central Processing Unit|CPU]] and/or [[main memory]], and [[interrupt]]s to get the CPU to pay attention to the device.

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← Older revision		Revision as of 00:06, 16 December 2018
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 They are usually attached to a computer to pass data in and out of the computer - either to [[secondary storage]] which is permanently accessible; some other form of data storage, intended for off-line storage (e.g. [[magnetic tape]]); or communication, either to [[user]]s or other computers, etc. A few device types (such as [[real-time clock]]s) perform non-[[input/output|I/O]] functions.
-Devices may use either [[programmed I/O]] or [[Direct Memory Access|DMA]] to get data in and out of the [[Central Processing Unit|CPU]] and/or [[main memory]], and [[interrupt]]s to get the CPU to pay attention to the device when needed.
+Devices (or, more accurately, their controllers) may use either [[programmed I/O]] or [[Direct Memory Access|DMA]] to get data in and out of the [[Central Processing Unit|CPU]] and/or [[main memory]], and [[interrupt]]s to get the CPU to pay attention to the device when needed.
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← Older revision		Revision as of 00:20, 21 August 2018
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−	A '''peripheral''' or '''device''' is a separate mechanism (always including some [[electronic]] [[hardware]], but often also some mechanical constituents) attached to a computer. They are ~~usually~~ divided into a [[device controller]] which is directly attached to the computer, and mediates between it and the actual device.	+	A '''peripheral''' or '''device''' is a separate mechanism (always including some [[electronic]] [[hardware]], but often also some mechanical constituents) attached to a computer. They are often divided into the actual device, and a [[device controller]] which is directly attached to the computer, and mediates between it and the actual device.

	They are usually attached to a computer to pass data in and out of the computer - either to [[secondary storage]] which is permanently accessible; some other form of data storage, intended for off-line storage (e.g. [[magnetic tape]]); or communication, either to [[user]]s or other computers, etc. A few device types (such as [[real-time clock]]s) perform non-[[input/output\|I/O]] functions.		They are usually attached to a computer to pass data in and out of the computer - either to [[secondary storage]] which is permanently accessible; some other form of data storage, intended for off-line storage (e.g. [[magnetic tape]]); or communication, either to [[user]]s or other computers, etc. A few device types (such as [[real-time clock]]s) perform non-[[input/output\|I/O]] functions.

← Older revision		Revision as of 13:40, 20 August 2018
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−	A '''peripheral''' or '''device''' is a separate mechanism (always including some [[electronic]] [[hardware]], but often also some mechanical constituents) attached to a computer.	+	A '''peripheral''' or '''device''' is a separate mechanism (always including some [[electronic]] [[hardware]], but often also some mechanical constituents) attached to a computer. They are usually divided into a [[device controller]] which is directly attached to the computer, and mediates between it and the actual device.

	They are usually attached to a computer to pass data in and out of the computer - either to [[secondary storage]] which is permanently accessible; some other form of data storage, intended for off-line storage (e.g. [[magnetic tape]]); or communication, either to [[user]]s or other computers, etc. A few device types (such as [[real-time clock]]s) perform non-[[input/output\|I/O]] functions.		They are usually attached to a computer to pass data in and out of the computer - either to [[secondary storage]] which is permanently accessible; some other form of data storage, intended for off-line storage (e.g. [[magnetic tape]]); or communication, either to [[user]]s or other computers, etc. A few device types (such as [[real-time clock]]s) perform non-[[input/output\|I/O]] functions.

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-A '''peripheral''' or '''device''' is attached to a computer usually in order to pass data in and out of the computer - either to [[secondary storage]] which is permanently accessible; some other form of data storage, intended for off-line storage; communication, either to users or other computers, etc. A few device types (such as [[real-time clock]]s) perform non-[[input/output|I/O]] functions.
+A '''peripheral''' or '''device''' is a separate mechanism (always including some [[electronic]] [[hardware]], but often also some mechanical constituents) attached to a computer.
-Devices may use either [[programmed I/O]] or [[Direct Memory Access|DMA]] to get data in and out of the [[Central Processing Unit|CPU]] and/or [[main memory]], and [[interrupt]]s to get the CPU to pay attention to the device.
+They are usually attached to a computer to pass data in and out of the computer - either to [[secondary storage]] which is permanently accessible; some other form of data storage, intended for off-line storage (e.g. [[magnetic tape]]); or communication, either to [[user]]s or other computers, etc. A few device types (such as [[real-time clock]]s) perform non-[[input/output|I/O]] functions.
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