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Microsoft Windows XP 64-bit Edition was a version of Microsoft 's Windows XP Operating System designed to run on Intel Itanium family of Microprocessor s in their native IA-64 mode. It should not be confused with Windows XP Professional X64 Edition , which is designed for X86-64 processors. As of July 2005, Windows XP 64-bit Edition is no longer supported. Two versions of Windows XP 64-bit Edition were released:
Windows XP 64-bit Edition wasn't marketed as the Itanium version one of Microsoft's other Windows XP editions ('Home', 'Professional', 'Media Center' or 'Tablet PC') but was a separate edition made solely for the Itanium processor and its 64-bit instructions. However it was mostly analogous to Windows XP Professional, but with some limitations:
However, unlike previous alternate architecture ports of Windows ( Windows NT 4.0 for PowerPC , MIPS R4x00, and Alpha ) Windows XP 64-bit Edition could run standard x86 32-bit applications through its WOW64 (Windows on Windows) Emulation layer. While the original Itanium processor contains an on-chip IA-32 decoder, it was deemed far too slow for serious use (Running at about 400MHz), so Microsoft and Intel wrote a software 32 to 64 bit translator dubbed the IA-32 Execution Layer . It allows real time translation of x86 32-bit instructions into IA-64 instructions, allowing 32-bit applications to run (albeit significantly more slowly than native code). LIMITATIONS Windows XP 64-bit Edition does not run 32-bit applications at their native speed, and the emulation is slow. This is rather a limitation of the Itanium microprocessor which does not support x86 native mode without emulation. Also, software compatibility was an issue. Security updates were discontinued for Windows XP 64-bit Edition because of the later release Windows XP Professional X64 Edition . REFERENCES EXTERNAL LINKS
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