Back in the 1980′s, I used to cover my computer when it was not in use. I covered the Coleco ADAM, Atari 400, and IBM PS/1. I was doing this up until the early 1990s to prevent dust from getting into the system. If you were cool, you got covers specifically made for your system. In most of my computer covering days, I used a big garbage bag or piece of thin vinyl.
As the price of computers dropped, so did my fear of getting dust into the system. These days I do not cover any of my PCs. Do any of you still continue that practice?