hw/i386.reference/c14.htm

   1 <!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
   2 <HTML>
   3 <HEAD>
   4 <TITLE>80386 Programmer's Reference Manual -- Chapter 14</TITLE>
   5 </HEAD>
   6 <BODY>
   7 <B>up:</B> <A HREF="toc.htm">
   8 Table of Contents</A><BR>
   9 <B>prev:</B> <A HREF="s13_03.htm">13.3  Differences From 80286</A><BR>
  10 <B>next:</B> <A HREF="s14_01.htm">14.1  Physical Address Formation</A>
  11 <P>
  12 <HR>
  13 <P>
  14 <H1>Chapter 14  80386 Real-Address Mode</H1>
  15 <P>
  16 The real-address mode of the 80386 executes object code designed for
  17 execution on 8086, 8088, 80186, or 80188 processors, or for execution in the
  18 real-address mode of an 80286:
  19 <P>
  20 In effect, the architecture of the 80386 in this mode is almost identical
  21 to that of the 8086, 8088, 80186, and 80188. To a programmer, an 80386 in
  22 real-address mode appears as a high-speed 8086 with extensions to the
  23 instruction set and registers. The principal features of this architecture
  24 are defined in
  25 <A HREF="c02.htm">Chapters 2</A> and
  26 <A HREF="c03.htm">3</A>.
  27 <P>
  28 This chapter discusses certain additional topics that complete the system
  29 programmer's view of the 80386 in real-address mode:
  30 <UL>
  31 <LI>Address formation.
  32 <LI>Extensions to registers and instructions.
  33 <LI>Interrupt and exception handling.
  34 <LI>Entering and leaving real-address mode.
  35 <LI>Real-address-mode exceptions.
  36 <LI>Differences from 8086.
  37 <LI>Differences from 80286 real-address mode.
  38 </UL>
  39 <P>
  40 <A HREF="s14_01.htm">14.1  Physical Address Formation</A><BR>
  41 <A HREF="s14_02.htm">14.2  Registers and Instructions</A><BR>
  42 <A HREF="s14_03.htm">14.3  Interrupt and Exception Handling</A><BR>
  43 <A HREF="s14_04.htm">14.4  Entering and Leaving Real-Address Mode</A><BR>
  44 <A HREF="s14_05.htm">14.5  Switching Back to Real-Address Mode</A><BR>
  45 <A HREF="s14_06.htm">14.6  Real-Address Mode Exceptions</A><BR>
  46 <A HREF="s14_07.htm">14.7  Differences From 8086</A><BR>
  47 <A HREF="s14_08.htm">14.8  Differences From 80286 Real-Address Mode</A>
  48 <P>
  49 <HR>
  50 <P>
  51 <B>up:</B> <A HREF="toc.htm">
  52 Table of Contents</A><BR>
  53 <B>prev:</B> <A HREF="s13_03.htm">13.3  Differences From 80286</A><BR>
  54 <B>next:</B> <A HREF="s14_01.htm">14.1  Physical Address Formation</A>
  55 </BODY>