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MVS/380 - 31-bit MVS - 25 years in the making
The last public domain version of the MVS operating system only supported a 24-bit address space, which is a pain if you want to run modern software. This is a novel solution using Hercules: they've invented a new backwards-compatible 31-bit architecture ("S/380") which the older OS can easily be ported to! Very neat.
to emulation hercules ibm mainframe mvs retrocomputing s370 s380 ... on 26 July 2014
60bits.net - Control Data Mainframe information
"The emphasis is on Michigan State University's obscure SCOPE/Hustler operating system."
to 60bit cdc mainframe retrocomputing ... on 25 May 2014
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tasty by Adam Sampson.