From: muta...@gmail.com   
      
   On Monday, July 19, 2021 at 8:40:46 PM UTC+10, Joe Monk wrote:   
      
   > > On the mainframe I produce a single executable that works   
   > > in AM24 on the S/370, AM31 on the S/390, and AM32 on   
   > > the S/380. I used to have separate compiles for 24 vs 31   
   > > until I figured a technique - without kludging which is all   
   > > I had been informed about prior to that - that enabled   
   > > one binary to handle all modes. I have considered   
   > > dropping down one more level and targeting the S/360.   
   > > The GCC i370 target targets the S/370, and that is what   
   > > I inherited, so that is what my starting point was.   
      
   > AM31 is copyrighted, licensed technology from S/370 XA,   
   > just like AM64 is copyrighted, licensed technology from   
   > z/Arch. It is not public domain.   
      
   Crikey.   
      
   AM31 is a concept, not a body of writing subject to copyright.   
   You can *potentially* patent that concept. I don't know or care   
   if IBM did that, but if they did, the patents expired long ago, and   
   it is now the equivalent of public domain.   
      
   Ditto for AM64, but the original AM64 and instructions, if they   
   were ever patented (or even a subset patented), just came out   
   of patent (after 20 years, starting in 2000), so are now free for   
   everyone to use.   
      
   Trademarks will last forever though. If IBM has managed to   
   somehow trademark AM31, they could prevent me from   
   advertising any commercial product of mine as "supporting   
   AM31" unless I mention that. So far I am not advertising any   
   commercial product, so I'm not going to bother looking up   
   any trademarks.   
      
   BFN. Paul.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)