So good memories the day I obtained the floppy with Drops with dope. Awesomeness. One the same bunch, another floppy of a unixlike RT OS, which I cannot now recall the name to save my life...the then blackberry one.
QNX -- http://toastytech.com/guis/qnxdemo.html (or https://news.ycombinator.com/item?id=44856046)