The i386/i486 system operates in the real-address mode when the processor emulates the execution of the 8086/88 processor. In this mode, the i386/i486 processor provides more instructions and extension registers (32-bit registers), which makes it the superset of the 8086/88 processor. The emulation consists of environment emulation and instruction execution emulation. This chapter explains how the i386/i486 processor performs this emulation.
KeywordsSegment Register Segment Address Advance Program Base Address Protected Mode
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