Arup entered his USB device not recognized design into the Open 7400 Logic Competition. It uses a logic chip to stimulate a USB host just enough to get a “Device not recognized” response from Windows. Once the prank succeeds a “1” is displayed on a 7 segment display.
Via the forum.
USB host or USB Device?
DP knows, (DP is the blogger who posted this in the blog)
shouldn’t you know as well, since you made the device? :-P