AMD 80386 Processor

关于 AMD 80386

AMD 80386 处理器于 1991 年推出。1987 年英特尔终止许可协议后，AMD 抄袭 80x86 微指令，开发了自己的 386。

80386SX 在内部以 32 位工作，但在外部仅以 16 位工作。第一代 CPU 的时钟频率仅为 16 MHz，因此比最快的 286 处理器要慢。这些产品在推出时就被售出，这是由于它们的新功能以及较低的入门级价格。

除了真实模式和保护模式， 386 还提供虚拟模式，让真正的多任务处理成为可能。此外，与 80286 不同，它们可以在 3 种模式之间来回切换，而无需重新启动系统。

随着 AMD 的 386 DX 或 DXL 版本，买家的竞争开始了。它们通过 32 位宽的数据总线在内部和外部工作，并由 AMD 提供高达 40 MHz 的时钟。AMD 的 386 采用 0.8 µm 生产工艺制造，拥有 275,000 个晶体管。

Introduction

The Am386 CPU was released by AMD in 1991. A 100%-compatible clone of the Intel 80386 design, it sold millions of units and positioned AMD as a legitimate competitor to Intel, rather than just a second source for Intel’s x86 CPUs.

While the CPU was essentially ready to be released prior to 1991, Intel kept it tied up in court. AMD had previously been a second-source manufacturer of Intel’s designs, and AMD’s interpretation of the contract was that it covered all of them. Intel, however, claimed that the contract only covered the 80286 and prior processors. After a few years in the courtrooms, AMD finally won the case and the right to sell their Am386. This paved the way for competition in the CPU market and thus lowered the cost of owning a PC.

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AMD Am386DX/DXL-40