操作系统类时间片轮转调度算法，文本输入输出，每个进程都有一个PCB，进程数、进入内存时间、时间片长度、计算时间、I/O时间可以设定。-The operating system class time slice time-sliced algorithm, the text input/output, each process has a number of processes, PCB, into memory time, time piece length, calculation time,