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'''Spine''' is a compatibility layer developed for Linux that allows PlayStation 4 games to work. The project is was largely developed in private by a single developer, spinedev.

Spine's [https://github.com/devofspine/spinedemo first public demo] was the first to launch commercial games. More builds have since been released which supports many more commercial titles. Its authenticity was verified by AlexAltea, an early contributor to [[RPCS3]] and maintainer of [[Orbital]].<ref>[https://www.reddit.com/r/emulation/comments/bz4ikp/orbital_a_playstation_4_emulator_that_is/eqq6lxt/ AlexAltea] on Reddit. "I've analyzed the Spine demo in IDA Pro (reverse engineering tool), and everything checks out. It's obviously a very early release, lots of unimplemented parts, but it's real. More importantly, we have tested it locally , and it works."</ref>Has stopped development.