In fact, I suspect that USB's engineers have based their designs on Apple's ADB. They share the most important features: one serial data line and two power lines shared by all devices, an addressing schema for enumerating devices, and a flow control protocol to allow the devices to share the data line. USB only increases the device limit (from 16 to 127) and the data rate (from few thousand bps to 10 Mbps) and offers "hot-swap" capabilities. But in concept they are *very* simmilar.
One more thing that the PC has copied from Apple...
Sorry? what did the pc copy from apple regarding a very off topic usb?
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