Operating Systems Time-Sharing Systems-Interactive Computing c The CPu is multiplexed among several jobs that are kept in memory and on disk (the cpu is allocated to a job only if the job is in memory).(复用) 矿 A job is swapped in and out of memory to the disk.(换入,换 出) e On-line communication between the user and the system is provided; when the operating system finishes the execution of one command it seeks the next control statement" not from a card reader, but rather from the user' s keyboard.(交互驱动) c On-line system must be available for users to access data and code(及时的处理数据和代码) Gao Haichang, Software School, Xidian University 16Operating Systems Gao Haichang , Software School, Xidian University 16 Time-Sharing Systems–Interactive Computing  The CPU is multiplexed among several jobs that are kept in memory and on disk (the CPU is allocated to a job only if the job is in memory). （复用）  A job is swapped in and out of memory to the disk.（换入，换 出）  On-line communication between the user and the system is provided; when the operating system finishes the execution of one command, it seeks the next “control statement” not from a card reader, but rather from the user’s keyboard. （交互驱动）  On-line system must be available for users to access data and code.(及时的处理数据和代码)