On Wed, 30 Mar 2016 07:42:10 -0700, Ed Jaffe wrote:

>      LOAD  EPNAME==CL8'MSGTABLE'    Load external message table
>      NILH  R1,X'7FFF'               Turn off AMODE indicators
>      NILL  R1,X'FFFE'               (same)
>      STG   R1,MsgTable              Save clean table address

ITYM R0.

And the manual doesn't specify that the address returned is a clean 64-bit 
address except if it is AMODE 64. So I'd suggest replacing the NILH with

       LLGTR R0,R0

-- 
Tom Marchant

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