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32/64-Bit 80x86 Assembly Language Architecture by James Leiterman

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Chapter 1. Introduction

When the processor manufacturer Intel is mentioned, two 64-bit processors come to mind: EM64T and the Itanium. For AMD: the AMD64. Non-80×86 manufacturers discovered years ago that competing against an established desktop market is difficult to impossible. The key to successful market injection is being able to run a large quantity of pre-existing applications. Intel and AMD have built their business upon this by periodically creating superset instruction sets for their 80×86 processors so that pre-existing software still runs on the new equipment and new software can be written for the new equipment.

The technology has been forked into two 64-bit paths. One uses the Itanium-based platform with a new 64-bit primary instruction ...

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