输入是通过“转换开关”（I/O地址255）实现的，这8个乒乓开关位于面板左侧。

Input was accomplished through the "Sense Switches" (I/O address 255), eight toggle switches on the left side of the front panel.

youdao

平时，刚开始上课的时候，在街上就能听到课桌开开关关的乒乓声和孩子们一遍遍高声念课文的读书声。

Usually at the beginning of school, the noise of desks being opened and closed, and lessons repeated at the top of the children "s voices could be heard out in the street."

youdao

针对乒乓式励磁回路接地保护，结合开关自检方法提出了完整的一点接地保护方案；

Based on the ping-pong type field grounding protection, it presents one-point-to-ground protection scheme by integrating the self-checking method of switches.

youdao