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In computing, protected mode, also called protected virtual address mode, [1] is an operational mode of x86-compatible central processing units (CPUs). It allows system software to use features such as segmentation , virtual memory , paging and safe multi-tasking designed to increase an operating system's control over application software .
The first DPMI specification drafts were published in 1989 by Microsoft's Ralph Lipe. [4] [1] While based on a prototypical version of DPMI for Windows 3.0 in 386 enhanced mode, several features of this implementation were removed from the official specification, including a feature named MS-DOS Extensions [5] or DOS API translation that had been proposed by Ralph Lipe in the original drafts. [6]
Real mode causes the processor to mostly act as if it was an original 8086, while virtual 8086 mode allows the creation of a virtual machine to allow the running of programs that require real mode in order to run under a protected mode environment. Protected mode is the non-legacy mode of 32-bit x86 processors and the 80286. Most PC graphic ...
Web Browser Extensions: Operating Systems - Windows 7 or later, Mac OS X 10.7 (Lion) or later, Linux, Chrome OS Web Browsers - Internet Explorer 11 or later (Note: Enhanced Protected Mode is not ...
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Web Browser Extensions: Operating Systems - Windows 7 or later, Mac OS X 10.7 (Lion) or later, Linux, Chrome OS Web Browsers - Internet Explorer 11 or later (Note: Enhanced Protected Mode is not ...
In computing, the Virtual Control Program Interface (VCPI) is a specification published in 1989 by Phar Lap Software that allows a DOS program to run in protected mode, granting access to many features of the processor not available in real mode. It was supplanted by DOS Protected Mode Interface (DPMI) shortly after being introduced, due in ...
Web Browser Extensions: Operating Systems - Windows 7 or later, Mac OS X 10.7 (Lion) or later, Linux, Chrome OS Web Browsers - Internet Explorer 11 or later (Note: Enhanced Protected Mode is not ...