Tech Talk #113 – September 28, 2019 The Universal Serial Bus, or USB. You know, that plug that can only go in one of two ways, but still takes three tries to get it plugged in? Yeah, that one. Where did USB come from, where is it going? And why? If you don’t know anything about PS/2 connectors, or parallel ports, DIN connectors, SCSI, Firewire, or 9-pin or 25-pin serial ports, you can thank USB.