The clock interrupt processing program tests the state of the printer intermittently, and decides whether the printer will be started again.
时钟中断处理程序定时地去查询打印机的状态，决定是否再次启动打印机。
The invention adds the judgment of the length of software system management interrupt command in the software system management interrupt processing program.
本发明于软件系统管理中断处理程序，增加了对软件系统管理中断指令的长度判断。
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