Yes, if you want to be able to read CathInfo post-EMP attack, you'll need to build a Faraday cage around your PC.
Seriously, it's a danger that many have pointed out, to which the world is extremely vulnerable. Cars, computers, anything with sensitive electronics would be shorted out if an EMP hit your area.
EMP can be produced by a high-altitude nuclear blast. It covers a wider area, but there's almost zero fallout. But who needs fallout when you can disable the entire enemy's electronics and send most of his country back to the 1850's?
Matthew