Regarding LPSW / LPSWE:

The POp is correct.


  *   A z/Architecture PSW is 16 bytes.
  *   The operand of LPSWE is 16 bytes.
  *   The operand of LPSW is 8 bytes from which a 16 byte PSW is formed.

Thus you cannot provide a 16-byte PSW via LPSW.
A specific case where you need LPSWE rather than LPSW is for an instruction 
address >= 2G.

Peter Relson
z/OS Core Technology Design


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