"A program running on z/OS and the zSeries mainframe can run with 24-, 31-, or 64-bit addressing (and can switch among these if needed)." https://www.ibm.com/d

"A program running on z/OS and the zSeries mainframe can run with 24-, 31-, or 64-bit addressing (and can switch among these if needed)." https://www.ibm.com/docs/en/cics-ts/5.4?topic=basics-24-bit-31-bit-64-bit-addressing https://www.ibm.com/docs/en/cics-ts/5.4?topic=basics-24-bit-...