The Minneapolis school district had recently purchased an HP 2100 minicomputer, and the schools the trio were teaching in, like the other schools in the district, were connected to it via a single teleprinter. These teleprinters could send and print messages from programs running on the central computer.[1] The video game industry was in its infancy in 1971, and the three had no resources to draw on to develop the game software beyond their own programming knowledge; instead, they spent two weeks working and coding in HP Time-Shared BASIC on their own.[5][6] Rawitsch focused on the design and historical portions of the game, while Heinemann and Dillenberger did the programming, working on the teleprinter kept in a small room that was formerly a janitor's closet at the school they taught at, Bryant Junior High School, as well as bringing it to the apartment to continue working.[4][6] Heinemann focused on the overall programming flow, and came up with the hunting minigame, while Dillenberger made subroutines for the game to use, wrote much of the text displayed to the player, and tested for bugs in the code.[6] As there was only one terminal, Heinemann wrote code on paper while Dillenberger entered it into the system along with his own.[7]