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CX-83D87 于 1989 年推出。它是最快的 387 兼容协处理器，性能比 Intel 387DX 高 50%，还提供所有协处理器中最精确的超越函数。

FPU for 386DX CPU

CX-83D87 于 1989 年推出。它是最快的 387 兼容协处理器，性能比 Intel 387DX 高 50%。83D87 还提供所有协处理器中最精确的超越函数。它是与 Intel 387DX 兼容程度最高的 387 克隆。与 Intel 387DX 不同，83D87（以及所有其他与 387 兼容的芯片）不支持 CPU 和协处理器的异步操作。为了降低功耗，83D87 具有先进的省电功能。协处理器中不需要的部分会自动关闭。如果没有协处理器指令正在执行，则除总线接口单元之外的所有部分都将关闭。

The CX-83D87 was introduced in 1989. It is the fastest 387-compatible coprocessor and provides up to 50% more performance than the Intel 387DX. The 83D87 also offers the most accurate transcendental functions of all coprocessors. It is the 387 clone with the highest degree of compatibility to the Intel 387DX. Unlike the Intel 387DX, the 83D87 (and all other 387-compatible chips as well) does not support asynchronous operation of CPU and coprocessor. To reduce power consumption the 83D87 features advanced power saving features. Those portions of the coprocessor that are not needed are automatically shut down. If no coprocessor instructions are being executed, all parts except the bus interface unit are shut down.