IBM's follow-on mainframe operating system to OS/360 MFT was OS/VS1, which became available in 1972. VS1, like MFT, was intended for medium-sized mainframe workloads, and provided a single virtual address space of up to 16 megabytes (although it could be smaller if the user so chose). Also like MFT, VS1 provided multiprogramming with a comparatively inflexible storage management approach, in which available storage was carved up into fixed-size partitions whose sizes could only be changed by the operator.
Like MFT, unlike MVT and OS/VS2, VS1 did not provide an interface for online interactive users (like TSO in MVT and VS2). VS1 partitions supported non-interactive batch processing applications.
VS1 was "functionally stabilized," to use the picturesque IBM expression, in 1984.
Home > Hercules > VS1