For married dependents who are under the age of 65 and not blind, you generally must file a federal income tax return if your unearned income was more than $950; if your earned income was over $5,950; or if your gross income was at least $5 and your spouse files a separate return and itemizes deductions.
The Atari 2600 came out in 1977. Originally known as the VCS or  Video Computer System, it was renamed to it's catalog number  (CX-2600) in 1982.
The source code was made available to anyone who requested it. Computer Space made in 1971 by Nutting Associates was the world's first commercially sold video game of any kind. The coin-operated video game was created by Nolan Bushnell and Ted Dabney, the later founders of Atari.