GRAETZ, J. MARTIN. 1981. ↑The origin of Spacewar. ↑Creative Computing 7(8): 56-67, ↑reprinted 1983 in ↑Creative Computing Video & Arcade Games ↑1(1): 78-??.    The picture at the top is a snippet of an illustration that accompanied the 1983 reprint. The second picture shows how “Spacewar” actually looked on the original machine, a PDP-1, it ran on. … Continue reading