输入输出接口概述中止控制接口8259守时计数接口8253并行通讯接口8255串行通讯接口8250模数数模转换接口
(I/O interface overview Stop control interface 8259 Timekeeping count interface 8253 Parallel communication interface 8255 Serial communication interface 8250 Analog-to-digital digital-to-analog conversion interface)
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