NeweggBusiness - StarTech.com PS22USB PS/2 to USB Keyboard and Mouse Adapter
Manhattan PS/2 / USB Keyboard/mouse Cable [2x PS/2 socket - 1x USB 1.1 connector A] 20.00 cm Black | Conrad.com
What preceded the PS2 port for a computer keyboard? - Quora
Amazon.com: JXSZ PCI-Express to 2xPS2 PS/2 Keyboard and Mouse Port Expansion Card Without USB Ports : Electronics
C2G 3ft USB to Dual PS2 Keyboard and Mouse Adapter Cable 3 ft PS2USB Data Transfer Cable for KeyboardMouse First End 1 x 4 pin USB Type A Male Second End 2
keyboards - Why is there only one PS/2 port on my computer? - Retrocomputing Stack Exchange