Gotta love the greenscreen, I haven't used one of those in many years, my dad used to have some computer in his loft that had a green screen, no idea how the thing was meant to work, but it was pretty cool and had 5 1/4" drives, somehow he managed to write a CV and a job application on it (and printed off on Dot Matrix or Daisy wheel printer (can't recall that part in detail)), it definitely wasn't the usual flavours of DOS though, I've no idea what make the computer was...
I shall PM about the 5 1/4" drives...