On Mon, 27 May 2013 14:25:21 +0700, Robin Atwood wrote:

>I also
>found a presentation that claimed the BEA was saved in low memory at 110.
>but a few dumps I looked at did not bear this out (pun intended!).

You should read the POO.

"When the PER-3 facility is installed 
and a program interruption occurs, whether or not 
PER is indicated, the contents of the breaking-eventaddress 
register are stored in real storage locations 
272-279."

That's every time a program interruption occurs.  Including a page fault. 
And don't forget it's a 64-bit register that is stored in a doubleword.

-- 
Tom Marchant

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