That famous QNX boot disk was the first thing I thought of when reading the title as well.

Me too! And the GUI was only a 40KB distribution and was waaaaaay better than Windows 3.0!

	▲	jacquesm 2 hours ago \| parent [-]
		And incredibly responsive compared to the operatings systems of even today. Imagine that: 30 years of progress to end up behind where we were. Human input should always run at the highest priority in the system, not the lowest.