computer lab at the University of California, Irvine while teaching himself how to program. The lab operated both a SDS Sigma 7 and a DEC PDP-10 mainframe computer. The PDP-10 hosted a copy of Spacewar!, a multiplayer space combat video game developed in 1962 in the early history of video games. Mayfield had gained illicit access to the Sigma 7 at the lab and wanted to create his own version of the game for the system. Spacewar! required a vector graphics display, however, and the Sigma 7 only had access to a non-graphical Teletype Model 33 ASR teleprinter. Mayfield decided to create a game in the vein of Spacewar! that could be played on a teleprinter and brainstormed several ideas with his friends. As none of the group had much experience with computers, most of the ideas were unfeasible, but one concept he liked and thought was possible was a game based on Star Trek, then in syndication on television. The concept included the game printing a map of the galaxy and a map of the local star system, and phaser weapons whose attack power declined over distance. Mayfield began to program the game, creating a punched tape of the game at the end of each programming session and loading it back into the computer the next day. He worked on the game through the rest of the school year and into the summer after graduating. Later that summer, Mayfield purchased an HP-35 calculator and often visited the local Hewlett-Packard sales office. The staff there offered to let him use the HP 2000C minicomputer at the office if he would create a version of his Star Trek game for it; as the version of the BASIC programming language on the computer was different from the Sigma 7, he elected to abandon the Sigma 7 version and rewrite the program from scratch. He completed it on October 20, 1972, and the game was added to the HP public domain Contributed Program library of software as STTR1 in February 1973, with Mayfield attributing the game to Centerline Engineering, a company he was considering starting. It was also published in the People's Computer Company newsletter, and republished in their collection book, What to Do After You Hit Return (1975). David H. Ahl was an employee in the education department of Digital Equipment Corporation (DEC). He had begun the Edu newsletter where user-submitted games