On Fri, 29 Apr 2011 15:10:42 -0400, Micheal Butz wrote:
>
>Just saw something really strange
>
>BALR R14,R15.
>
>Didn't update the high order bit of R14
>
What was the addressing mode in effect?
What was the subsequent content of 14?
("Didn't update" leaves considerable ambiguity.)
Eileen's citation from PoOps (PrOps) matches my decades-old
recollection. I used BALR to test entry addressing mode on
RMODE 24 code which could be entered either on 370 or on XA
with AMODE 31. I saved the addressing mode in the RSA for
R14, and returned with
LM ...
LTR R14,R14
BPR R14
BSM R14 (IIRC)
-- gil
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