Tony Duell wrote:
  Cheating a bit, but how about FIGforth? I believe
it is truely public
 domain, and as it runs on the bare metal, it could be claimed to include
 the OS. I assume there was/is a version of the 8088. 
 Yes, but try and find it today.  Fig forth is for the 8080 and 6502 with I/O 
What did happen to all the FIGforth source listings? I am very suprised
they're not on an ftp site somewhere (but yes, I have looked :-()
  supplied by the user and ASM source. While I suspect
you can get a 
It ran on a darn sight more than those 2 processors. There was certainly
a Z80-specific version (I bought the listing for that), a 6809 version, a
PDP11/LSI11 version, and probably a lot more.
  PS did the Jupiter Ace ever have floppy disk? 
Not offiically, but I wouldn't be suprised if somebody had hacked one on.
-tony