NVIDIA ceased production of the Xbox's GPU in August 2005, which marked the end of Xbox production and the quick release of the Xbox 360.
When equipped with a removable hard drive add-on, the Xbox 360 supports a limited subset of the Xbox's library through emulation. Emulation adds support for anti-aliasing as well as upscaling of the still standard definition image. These emulators are periodically updated to add compatibility for older games and are available for free through Xbox Live or as a file download to be burned to a CD/DVD from the Xbox web site. As the architectures are entirely different between Xbox and Xbox 360, software emulation is the only viable option for compatibility without including processors from the original Xbox,.