Protected mode - Revision history

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	Protected mode in the 286 is somewhat different from that of the [[Intel 80386\|80386]] and later machines, although the architecture of 286 protected mode is almost entirely upwardly compatible to that of the 386.		Protected mode in the 286 is somewhat different from that of the [[Intel 80386\|80386]] and later machines, although the architecture of 286 protected mode is almost entirely upwardly compatible to that of the 386.

			==External links==

			* [http://www.rcollins.org/articles/pvi1/pvi1.html Protected Mode Virtual Interrupts]

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	[[Category: Intel Microprocessors]]		[[Category: Intel Microprocessors]]

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			[[Category: Intel Microprocessors]]

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A pretty good start

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'''Protected mode''', on the [[Intel 80286|80286]] and later members of the [[Intel x86]] line, refers to a mode of the [[Central Processing Unit|CPU]] in which it enables the extended [[architecture]] of the later chips, including hardware support for [[virtual memory]].

These [[integrated circuit|chips]] power on in so-called [[real mode]], in which they appear to be [[Intel 8086|8086]]'s; this is for purposes of [[backward compatibility]] at the [[object code]] level. A small extension to that architecture allows them to switch into protected mode, where all the extended features of the later architecture are available.

'''''Note:''''' When an x86 CPU is in protected mode, than does not mean that one [[program]] running on the CPU necessarily ''is'' protected from another program, merely that it ''can be'', if the [[operating system]] sets up the [[memory management]], etc properly.

Protected mode in the 286 is somewhat different from that of the [[Intel 80386|80386]] and later machines, although the architecture of 286 protected mode is almost entirely upwardly compatible to that of the 386.

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