Source : Free On-Line Dictionary of Computing

OS-9
     
         A {real-time} {operating system} written by
        {Microware Corporation}.  The original version was written
        about 1978 for the {Motorola 6809} and has since been ported
        to the {Motorola 68000}, {Intel 80386}, {Intel 486}, and the
        {PowerPC}.  The {kernel} of OS-9 is {ROMable}, modular, with a
        unified file system, allowing it to easily be scaled up or
        down as required.
     
        {FAQ (http://os9archive.rtsi.com/os9faq.html)}.
     
        {User Group (http://www.cs.wisc.edu/~pruyne/os9ugfaq.html)}.
     
        {Usenet} newsgroup: {news:comp.os.os9}.
     
        (1996-04-03)