The ATI TV Wonder A636 is an external USB tuner device designed to receive and decode over-the-air digital (ATSC) and analog (NTSC) television broadcasts on a personal computer. This compact adapter enables users to watch live TV, pause live broadcasts, and record programming directly to their computer's hard drive, effectively turning a PC into a digital video recorder (DVR). It serves as a bridge for computers that lack a built-in TV tuner, providing access to free broadcast channels, including high-definition signals, using a standard coaxial antenna connection.

The tuner supports the ATSC digital standard used for terrestrial HDTV broadcasts in North America, allowing reception of crisp, high-definition channels when connected to an appropriate antenna. For compatibility with older broadcast sources or equipment, it also includes support for the legacy analog NTSC standard. The device typically comes with software that provides an electronic program guide (EPG), scheduling tools for recording shows, and basic video editing features. Connectivity is simple via a USB 2.0 port, drawing power directly from the computer, which makes it highly portable and easy to install without opening the computer case.

Designed for home media enthusiasts, the TV Wonder A636 offers a convenient way to integrate live television into a PC-based media center. Its plug-and-play functionality, combined with the provided software suite, allows users to easily manage and archive their favorite TV content. While primarily focused on terrestrial broadcasts, its functionality represents an accessible entry point into PC-based TV tuner technology for recording news, sports, and entertainment programming.