Question: Two roles of operating systems Shell and GUI, CPU modes (Kernel mode and user mode), Time and space multiplexing Multiprogramming and SPOOLing Program counter and

Two roles of operating systems

Shell and GUI, CPU modes (Kernel mode and user mode), Time and space multiplexing

Multiprogramming and SPOOLing

Program counter and PSW, Cash hit, RAM, ROM, Interrupt, BIOS

Process, interprocess communication, UID/GID, file, directory, path name, working directory, block/ character special files

System Calls, TRAP instruction

diogram ?

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