USB 1.0: Released in January 1996. Specified data rates of 1.5 Mbit/s (Low-Speed) and 12 Mbit/s (Full-Speed). Does not allow for extension cables or pass-through monitors (due to timing and power limitations). Few such devices actually made it to market. USB 1.1: Released in September 1998. Fixed problems identified in 1.0, mostly relating to hubs. Earliest revision to be widely adopted.
USB 1.0 已經定義了 Low Speed 和 Full Speed。 USB 1.1 只是修正一些問題。