Long description

There is a rectangular block with four partitions. There are further three vertical partitions in the first two partitions. The first partition is empty and categorized as System calls here with a forward arrow pointing toward the partition. The second partition with three partitions labeled CMS is categorized as Trap here with a forward arrow at the right side and I/O instructions here with a forward arrow on left. The three vertical partitions are categorized as Virtual 370 s. The third horizontal partition is labeled VM/370 and is categorized as Trap here with a forward arrow pointing toward the partition. There is a downward arrow from both forward arrows from both sides. The fourth partition is labeled 370 Bare hardware.