While ReactOS targets mainly the x86/AMD64 PC platform, an effort to port to the ARM architecture was at one point "under way", while it did not produce much functionality and was abandoned along with a port to PowerPC, that is no longer actively maintained. Support for the Xbox and the NEC PC-9800, a variant IA-32 architecture, was added through the use of an architecture-specific HAL. Improved 64-bit support for ReactOS is "being worked on", however, development seems to be going slowly.
