当总线空闲下来时，它可以重新填充额外的缓冲区。
总线空闲时，两条线都是高电平(集电极开路)。
The bus is "idle" when both lines are high (open-collector).
另外，这有助于缓解总线冲突问题——当总线繁忙时，程序可以处理额外的缓冲区，而不是等待总线空闲下来。
Also, this helps smooth out bus contention issues — when the bus is full, the program can process the extra buffers rather than wait for the bus to free up.
在它找到一个空闲总线后，它将修改VM配置文件，创建一个新CD - ROM，然后将CD装入到其中。
Once it finds one, it will modify the VM configuration file, create a new CD-ROM, and then mount the CD to it.
在+5V和每根线之间连接着一个电阻，所以总线的空闲状态是高电平。
A resistor is connected between each line and + 5v, so the idle state of the bus is high.
在+5V和每根线之间连接着一个电阻，所以总线的空闲状态是高电平。
A resistor is connected between each line and + 5v, so the idle state of the bus is high.
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