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This paper describes a real-time USB 2 subsystem for the Quest operating system. Quest is designed for real-time embedded systems. Such systems need to interact with their environment using sensors and actuators. On many embedded platforms today there is support for basic serial, USB 2.0 and 100 Mbps Ethernet. Of these, USB 2.0 supports the highest throughput, while also supporting real-time communication. We show how the Quest USB 2.0 sub-system improves upon some of the deficiencies in USBdoi:10.1109/rtas.2013.6531075 dblp:conf/rtas/MissimerLW13 fatcat:qrat6z374re6vk25zhjaad72iq