Diagnostic - Revision history

Jnc: +see also

2020-09-11T19:22:18Z

+see also

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2018-12-15T23:42:30Z

+cat

Jnc: Correct cat

2018-10-18T14:56:59Z

Correct cat

Jnc: Stubby, but a start

2018-07-14T11:13:48Z

Stubby, but a start

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A '''diagnostic''' is a piece of [[software]] which is designed to test the correct operation of some [[hardware]]. There are two main forms:

* Diagnostics which are used to verify that something is working properly.
* Diagnostics which are used to try and localize a fault, in order to repair it.

In many computers, the [[object code|code]] in [[read-only memory|ROM]] which is used to [[bootstrap|boot]] the machine includes code to verify that it is correctly operating.

Such code is often written in [[assembly language|assembler]], so it can use as little as possible of the [[Central Processing Unit|CPU]] to begin with; it then proceeds to test out each part of the machine (further [[instruction]]s, etc) before using them.

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 Such code is often written in [[assembly language|assembler]], so it can use as little as possible of the [[Central Processing Unit|CPU]] to begin with; it then proceeds to test out each part of the machine (further [[instruction]]s, etc) before using them.
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