Chase, John wrote:
-----Original Message-----
From: IBM Mainframe Discussion List On Behalf Of Van Dalsen, Herbie

[ snip ]

With my limited experience I deducted the following:

Someone wants to create a shared block of memory CSA/not and share it between programs. My understanding is that a 24-bit program can address 24-bit addresses, 31-bit...., 64-bit... So in my inexperienced mind the 24bit program could never share in the happiness of this above the bar heaven of shared storage.

Correct.  For an amode24 program, the entire universe ends at address
x'00FFFFFF'; the "next step" wraps back to x'00000000'.  So for an
amode24 program, there is nothing "above the line" or "above the bar"
because for it, there is neither a "line" nor a "bar".

That's also my understanding.
So, again, why 24-bit programs could be a reason for 2-4G hole ?


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Radoslaw Skorupka
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