Before revision: However, there are some single address space operating systems that run all processes within a single address space, such as IBM i, which runs all processes within a large address space, and IBM OS/ VS2 (SVS), which ran all jobs in a single 16MiB virtual address space.
After revision: VS1 and OS/However, there are some single address space operating systems that run all processes within a single address space, such as IBM i, which runs all processes within a large address space, and IBM OS/ VS2 (SVS), which ran all jobs in a single 16MiB virtual address space.