OS/2 began as a joint project between IBM and Microsoft as a successor to DOS, before IBM continued it alone with Warp 3 in the 1990s. Its boot sound was not an original synth theme but a trimmed collage of stock tracks from Network Music libraries, including a rising effect and a gothic hit chord, heavily compressed for the system. IBM ended support on 31 December 2006, yet OS/2 lived on in ATMs, transport systems and licensed successors such as eComStation and ArcaOS, keeping its sounds in retro computing culture.