Ahl left DEC and started "Creative Computing" magazine in 1974. He began porting the games from "101" to Microsoft BASIC, with the exception of "Star Trek", where he ported Leedom's version rather than Mayfield's original. The result was released in 1978 under the new name "BASIC Computer Games". This hit the market just as the first microcomputers able to run the game were coming to market. "BASIC Computer Games" went on to become the first million-selling computer book, and versions of the game were available for almost all personal computers of the era. Additionally, dozens of variants and expansions were made for a variety of other systems, based either on Leedom's or the original Mayfield versions.