-- The highest address below the bar is of course 7FFFFFFF. -- The highest non-data space address that will not definitely blow up when you reference it is 7FFFEFFF. The high page in 31-bit storage was made non-addressable for RAS/quality reasons (Bob Rogers, I believe, drove it, possibly with the advent of MVS/XA). -- The highest data space address is 7FFFFFFF.
The maximum region size is entertaining, but if you ever granted it, you would probably cause the address space to fail. There isn't room for x'7FF00000' bytes of user storage above the 16M line (and when you specify a region size that big, it applies to the area above 16M), Peter Relson z/OS Core Technology Design ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
