Xbox
Xbox is a video gaming brand created and owned by Microsoft of the United States. It represents a series of video game consoles developed by Microsoft, with three consoles released in the sixth, seventh, and eighth generations, respectively. The brand also represents applications (games), streaming services, and an online service by the name of Xbox Live. The brand was first introduced in the United States in November 2001, with the launch of the original Xbox console.
Xbox One
Following the release of the Xbox One and transition of Phil Spencer to the head of the Xbox division in 2014, he and software engineering vice president Kareem Choudhry restarted the backwards compatibility program in relative secret within the company. Choudhry brought on previous engineers that worked on Trioxide, including Kevin La Chapelle, Jonathan Morrison, and Barry Bond, to restart the program. The team chose to start with "Castle Crashers", which included Xbox networking features, to test backwards compatibility. "Castle Crashers" frequently crashed to a screen with alphanumeric codes, which La Chapelle was able to obtain from the game's developers, The Behemoth, which helped them to rapidly diagnose problems and fix the compatibility issues. Solving most of the major problems through "Castle Crashers", the background compatibility team decided to let the program be announced at E3 2015 with plans to have one hundred titles available by the end of 2015. However, by E3, they still found problems with some games running at extremely low framerates. During the event, Morrison recognized that a fundamental difference between the Xbox 360 and Xbox One was its scheduling rate, and when they returned, Morrison's idea helped them to rapidly complete work to meet its promised goal by the end of that year. Individual games still brought some difficulty, specifically "", but this prompted the team to develop automatic tools that could be used to identify where Xbox 360 titles would be difficult to run as-is on the Xbox One and how to work around those; this further set up the potential to improve Xbox 360 games on the future iterations of the Xbox One, such as the Xbox One X to improve graphics support.