Convert a PS/2 keyboard and mouse to a single USB interface. This PS/2 USB Adapter converts a single USB port into two universal PS/2 ports, letting you connect any PS/2 peripheral (e.g. mouse, keyboard) to a computer through USB.
StarTech.com 4-Port Multi Monitor Adapter, DisplayPort 1.2 MST Hub, 4x 1080p, Video Splitter for Extended Desktop Mode on Windows PCs Only, DP to Quad DP Monitors MST Hub - DP Multi Stream Transport Hub (MSTDP124DP) - video splitter - 4 ports
StarTech.com 2-Port Multi Monitor Adapter, DisplayPort 1.2 MST Hub, Dual 4K 30Hz or 1080p, USB Bus Powered, Video Splitter for Extended Desktop Mode on Windows Only, DP to 2x DP MST Hub - Multi Stream Transport (MSTDP122DP) - video splitter - 2 ports
StarTech.com 3-Port Multi Monitor Adapter, Mini DisplayPort 1.2 to 3x DisplayPort MST Hub, Triple 1080p or Dual 4K 30Hz, mDP to DP MST Video Splitter for Extended Desktop on Windows PCs - Multi Stream Transport (MSTMDP123DP) - video splitter - 3 ports