The EM64T reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

EM64T

EM64T (Extended Memory 64-bit Technology) is an extension to the IA-32 instruction set developed by Intel which adds 64 bit extentions to the x86 architecture. EM64T is reverse-engineered from and compatible with AMD's AMD64 instruction set extension.

Early reviews of the Nocona implementation of the architecture are not good [1] [1], with reviewers attributing this to many 64-bit instructions having been implemented by emulation rather than directly. However, it is expected to improve.

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