when I looked at the registers in TEST none had the high order bit on
I suggest that you read the principles of operation description of program
interrupt x'38'.
When in AMODE 64, all of bits 0-32 are relevant. The high bit that you
refer to, presumably, is bit 32 of the 64-bit GR.
If bit 32 is off, then at least one bit amidst 0-31 is on.
Peter Relson
z/OS Core Technology Design
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