From: james.harris.1@gmail.com   
      
   On 19/07/2021 13:36, Joe Monk wrote:   
   >   
   >> If they didn't publish a book that on the front cover   
   >> said:   
   >>   
   >> AM31   
   >>   
   >> by IBM   
   >> Copyright 1983, all rights reserved.   
   >>   
   >>   
   >> And on the first page said:   
   >>   
   >> AM31. 'Nuff said.   
   >>   
   >>   
   >> Then what exactly did they do that is subject to copyright?   
   >>   
   >   
   > They did. See S370-XA principles of operation, which explicity defines and   
   describes AM31, and says on the inside front cover:   
   >   
   > (c) Copyright IBM Corporation, 1983.   
      
   As a written work maybe it's the manual which is copyrighted.   
      
   For 31-bit addressing do you mean 'patented'?   
      
      
   --   
   James Harris   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)