M.A.D.

M.A.D. (which stands for Missile Attack and Defense) is an arcade action game somewhat similar to Missile Command. You control a photon cannon at the bottom of the screen, and your goal is to protect six energy stations located to your left and right. Waves of rockets and other ships will fly by on the screen, and occasionally one will drop in an attempt to destroy one of the stations. You need to make sure you shoot it before your energy station is destroyed! (mobygames.com)