depends... I remember seeing my professor painstakingly write formulas on the blackboard - it was such a waste of time. I'd normally have the textbook open on t

depends... I remember seeing my professor painstakingly write formulas on the blackboard - it was such a waste of time. I'd normally have the textbook open on the page with the same formulas and I'd entertain myself by trying to find any mistakes professor might have made. You can have dull professors with either blackboard or with projector. But professors who care can do significantly more with computer vs blackboard, especially with disciplines where videos might be useful.