In 1972, IBM announced System/370 hardware, which contained dynamic address translation, known as the DAT box, and provided virtual storage capability. To utilize the new hardware, OS/360 had to be transformed into a virtual storage operating system. ... A new feature called MVS/SP 1.3 was added to System/370. ... ESA/370 provided a new virtual storage space for data only, called a data space. ... The prime new concepts were simple. ...

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