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Intel 80386 Reference Programmer's Manual

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Chapter 14 80386 Real-Address Mode

The real-address mode of the 80386 executes object code designed for execution on 8086, 8088, 80186, or 80188 processors, or for execution in the real-address mode of an 80286:

In effect, the architecture of the 80386 in this mode is almost identical to that of the 8086, 8088, 80186, and 80188. To a programmer, an 80386 in real-address mode appears as a high-speed 8086 with extensions to the instruction set and registers. The principal features of this architecture are defined in Chapters 2 and 3.

This chapter discusses certain additional topics that complete the system programmer's view of the 80386 in real-address mode:

  • Address formation.
  • Extensions to registers and instructions.
  • Interrupt and exception handling.
  • Entering and leaving real-address mode.
  • Real-address-mode exceptions.
  • Differences from 8086.
  • Differences from 80286 real-address mode.

14.1 Physical Address Formation
14.2 Registers and Instructions
14.3 Interrupt and Exception Handling
14.4 Entering and Leaving Real-Address Mode
14.5 Switching Back to Real-Address Mode
14.6 Real-Address Mode Exceptions
14.7 Differences From 8086
14.8 Differences From 80286 Real-Address Mode


up: Table of Contents
prev: 13.3 Differences From 80286
next: 14.1 Physical Address Formation