The IBM 308X is a line of mainframe computers that implemented the IBM System/370 architecture and, starting in 1983, the System/370 Extended Architecture, which extended the original 24-bit addressing to 31-bits, thereby allowing programs to access much larger sets of data. S/370-XA was used in the new MVS/SP V2 operating system and the Start Interpretive Execution (SIE) instruction used by the new Virtual Machine/eXtended Architecture Migration Aid.
The IBM 308X is a line of mainframe computers that implemented the IBM System/370 architecture and, starting in 1983, the System/370 Extended Architecture, which extended the original 24-bit addressing to 31-bits, thereby allowing programs to access much larger sets of data. S/370-XA was used in the new MVS/SP V2 operating system and the Start Interpretive Execution (SIE) instruction used by the new Virtual Machine/eXtended Architecture Migration Aid.
Source: Wikipedia "IBM 308X" · CC BY-SA 4.0
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