I've always been fond of Apple's ADB. It seemed like the closest thing to USB as far as I know of, at least compared to IBM's PS/2. ADB seemed more versatile than PS/2, which was easy to mistake the PS/2 mouse port with the PS/2 keyboard port. The only other versatile port I can think was SCSI with it's ability to chain devices.
Yeah, this. Surprised more people haven't mentioned this. ADB was pretty far ahead of its time, considering it debuted with
More to the point... All this discussion about USB adoption without really mentioning what made it actually take off. The Original iMac. Only someone like Steve Jobs could get the company to agree to drop essentially ALL legacy support at once and force people into this newfangled thing. Apple missed the boat on CD-RW's for a few years, but the iMac really ignited widespread USB adoption on both sides of the divide.