From: joemonk64@gmail.com   
      
   >A standard C90-compliant program like GCCMVS   
   >only operates on a single address space.   
      
   No, it operates in whatever address space the initiator gives it. At inception   
   of task, that will either be Home or Primary.   
      
   > I do have a question though. If we switch from S/370 with   
   > 12-bit displacements to S/390 with what - 20-bit displacements? -   
   > does that enable the model James mentioned with a single   
   > code section? But that only works if the code section is   
   > less than 1 MiB (20-bits), ditto the data section? What do you   
   > do if either of those limits are exceeded?   
   >   
      
   Its not possible. RX instruction format only allows 12 bits for the   
   displacement... to keep things in a 4K page :)   
      
   You can write single CSECT programs today. Nothing stopping that.   
      
   Joe   
      
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