Protected mode - Revision history

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2021-03-15T14:06:26Z

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2018-10-22T18:34:36Z

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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 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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