From: joemonk64@gmail.com   
      
   > You need to actually do something with memory. I need to know if you   
   > are doing ANY instructions that use the full 64 bits of a register to   
   > address memory. If you are, it is a 64-bit program.   
      
   So, by that definition, every z/Arch program is 64-bit, regardless of AMODE.   
      
   All z/Arch physical memory accesses are 64-bit.   
      
   Joe   
      
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