Editing USB (section)

=== Human interface devices ===
{{Main|USB human interface device class}}

A USB mouse or keyboard can usually be used with older computers that have [[PS/2 port]]s with the aid of a small USB-to-PS/2 adapter. For mice and keyboards with dual-protocol support, a passive adapter that contains no [[Electronic circuit|logic circuitry]] may be used: the [[USB hardware]] in the keyboard or mouse is designed to detect whether it is connected to a USB or PS/2 port, and communicate using the appropriate protocol.{{Citation needed|date=May 2023}} Active converters that connect USB keyboards and mice (usually one of each) to PS/2 ports also exist.<ref>{{cite web |url=http://www.startech.com/Server-Management/KVM-Switches/PS-2-to-USB-Keyboard-and-Mouse-Adapter~PS22USB |title=PS/2 to USB Keyboard and Mouse Adapter |archive-url=https://web.archive.org/web/20141112214808/http://www.startech.com/Server-Management/KVM-Switches/PS-2-to-USB-Keyboard-and-Mouse-Adapter~PS22USB |website=StarTech.com |archive-date=12 November 2014 |access-date=21 May 2023}}</ref>