This input/output (I/O) operation is time-consuming, compared with the amount of time required to access data that’s already in computer memory.
与访问已经在计算机内存中的数据相比，这种输入/输出 (I/O) 操作非常耗时。
virtio is an input/output (I/O) para-virtualization framework for Linux that simplifies and expedites I/O traffic from a VM to a hypervisor.
virtio 是一个 Linux 的输入/输出（I/O）准虚拟化框架，它简化并加快了 VM 到管理程序的 I/O 通信。
The card can collect four axes' encoder pulse signals simultaneously, and control servo motor by four output analog voltage. Furthermore, it can control input and output I/O signals.
该运动控制卡能同时采集四轴的编码器脉冲信号，输出四路模拟电压控制伺服电机，同时能控制I/O信号的输入和输出。
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