You might get a lot of lectures,texts and videos about real time systems, online and those too by highly qualified people. I know this because I have surfed a lot over this topic. But none of them were interesting.
Being from technical stream, I am not very good at writing articles. I always like to keep my stuff in bullet marks or points.So I am really sorry if this blog doesn't fulfill your desire to read, but it will surely fulfill your desire to understand.
So,lets jump in the ocean of real time and taste some salts.