The 1998 iMac G3 was the 1st legacy-free computer that only had FireWire 400Mbps + USB-A 12Mbps as peripheral I/O.The iMac was a relatively small piece of the overall PC market in 1998 and the USB standard was developed by a consortium that didn't even include Apple https://en.wikipedia.org/wiki/USB . Intel did most of the development work, but all big boys in the PC world were on board. My recollection is that USB came on the scene pretty much simultaneously across all PC manufacturers, including the Taiwan Mobo manufacturers. Everybody was ready for something simpler than the RS 232 serial port. Apple was still pushing IEEE 1394 (firewire) in 1998, so the iMac using USB likely had more to do with the death of firewire than it did with the industry wide acceptance of USB.
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