IOGEAR - GCS1724 - 4 Port VGA KVM Switch, PS2 and USB
Black Box KVUSB-PS2 USB Keyboard and Mouse to PS/2 Computer Converter
Amazon.com: Tripp Lite Minicom PS2 to USB Converter for KVM Switch and Extender, Pure Hardware Solution, TAA GSA Compliant, 3-Year Warranty (0DT60002) : Electronics