Long description

There are four vertical C P U blocks from C P U 1 to C P U 4 and are labeled Runs Users and a shared operating system. A vertical memory block is highlighted with two horizontal partitions. The first partition is empty. The second partition is labeled Operating System and a small horizontal rectangular block on the right side is labeled Locks. There is a vertical Input or Output block. All vertical blocks labeled C P U, Memory, and Input or output are connected to a common bus.