Chapter 19. 486 Software Enhancements
The Previous Chapter
This chapter provided a description the 486 processor's hardware-related characteristics. This included the 486 roadmap, an overview of the 486 internal architecture, an overview of the 486 FSB, the A20 Mask signal, the on-die cache, and the on-die FPU. The discussion of the A20 Mask signal is directly applicable to all subsequent IA32 processors.
This Chapter
This chapter provides a detailed description of the software enhancement included in the 486 processor. This discussion is directly applicable to all subsequent IA32 processors and covers:
The on-die FPU.
The Alignment Checking Feature.
Paging-Related Changes
Caching-Related Changes to the Programming Environment.
The Test Registers. ...
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