In those days, working with computers meant writing code to save a byte here and an instruction cycle there.
在那些日子里，使用电脑意味着编写代码保存一个字节在这里，一个指令周期后又再取出来放到那里。
Its restrict conditions include system work cycle, communication protocol restriction, communication format assumption, multi-byte data and bit sign.
其约束条件包括系统工作周期、通信协议约束、通信格式约定、多字节数据及位标记。
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