From: mutazilah@gmail.com   
      
   For 35+ years I have wondered why there was no MSDOS for   
   the mainframe. I now have an EBCDIC FAT32 file system on   
   FBA disks on the mainframe and an operating system that can   
   do basic manipulation, like typing files.   
      
   Search for z/PDOS-generic at https://pdos.org   
      
   PDOS-generic has never been fleshed out because I wasn't sure   
   if it was truly portable or whether I was missing something. The   
   mainframe is always my go-to place for proving portability.   
      
   I'm not sure where to go from here. I think I might get an Atari   
   clone operational under PDOS-generic (I already have the Amiga)   
   to try to prove the technique of zapping a BSS variable on load   
   to inform the executable of the new environment so that it doesn't   
   do a real trap and instead does a callback. Actually it's mainly on   
   the mainframe that I need to do that, as the Atari has a control   
   block on entry that I can fill in with the callback overrides. Note   
   that I have an Amiga mini-clone already using this technique,   
   which I run under qemu-m68k (ie user, not system) on my   
   Manjaro Linux on a Pinebook Pro (ARM). My main development   
   system is still Windows 2000 running under qemu on the PBP,   
   and I just remembered today that that gave me access to Outlook   
   Express which I used a long time ago for News, and it still works.   
   So I didn't need to get my ArcaOS operational after all (which   
   has Thunderbird).   
      
   BFN. Paul.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)