> -----Original Message-----
> From: IBM Mainframe Discussion List On Behalf Of Shmuel Metz (Seymour J.)
>
> [ snip ]
>
> [1] I believe that a data space can be 4 GiB.
No; 2GiB (thru G6; can't speak to z/Arch.). The hardware (ucode) doesn't
distinguish between address space type when computing addresses; they're all
31-bit (when AMODE=31).
-jc-
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