80386有三种工作方式:实模式,保护模式和虚拟8086模式。本文介绍保护方式下的80386及相关的程序设计内容。实模式下的80386寄存器，寻址方式和指令等基本概念，除特别说明外在保护方式下仍然保持。-80386 has three modes: real mode, protected mode and virtual 8086 mode. This article describes the protected mode of 80386 and related programming content. 80386 real mode registers, addressing modes and instructions and other basic concepts, unless otherwise specified under external protection is maintained.