David H. Ahl was an employee in the education department of Digital Equipment Corporation (DEC), and he also collected BASIC games and distributed them in the company's "Edu" newsletter. He and fellow employee Mary Cole ported "STTR1" to DEC's BASIC-PLUS in the summer of 1973, with some additions, and he published this version in the newsletter. Ahl attributed the game to "Mike Mayfield of Centerline Engineering and/or Custom Data". In late 1973, he released the book "101 BASIC Computer Games", containing descriptions and the source code for early mainframe games and computer games written in BASIC. "101 BASIC Computer Games" was a landmark title in computer games programming, and was a best-selling title with more than 10,000 copies sold—more sales than computers in existence at the time. As such, the BASIC ports of mainframe computer games included in the book were often more long-lived than their original versions or other mainframe computer games. He included "Star Trek" in the book as "SPACWR", i.e. "Space War".