The System/370 reference article from the English Wikipedia on 24-Apr-2004
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System/370

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The System/370 is a line of IBM mainframes introduced in the early 1970s as the successor to the System/360 family. Later came the 370/XA and 370/ESA series, with enhanced address space. The 370/ESA was eventually rebranded as the System/390, and later still as the zSeries.