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The most important of these ECNs are included into the USB 2.0 specification package available from USB.org: Adds support for dedicated chargers (power supplies with USB connectors), host chargers (USB hosts that can act as chargers) and the No Dead Battery provision, which allows devices to temporarily draw 100 m A current after they have been attached.If a USB device is connected to a dedicated charger, maximum current drawn by the device may be as high as 1.8 A.A team including Ajay Bhatt worked on the standard at Intel; Microsoft Windows 95, OSR 2.1 provided OEM support for the devices.The first widely used version of USB was 1.1, which was released in September 1998.

Further modifications to the USB specification have been made via Engineering Change Notices (ECN).

It did not allow for extension cables or pass-through monitors, due to timing and power limitations.

Few USB devices made it to the market until USB 1.1 was released in August 1998, which introduced the speed of 12 Mbit/s (full speed).

There was no known miniature type A connector until USB 2.0 (rev 1.01) introduced one.

USB 2.0 was released in April 2000, adding a higher maximum signaling rate of 480 Mbit/s (High Speed or High Bandwidth), in addition to the USB 1.x Full Speed signaling rate of 12 Mbit/s.

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