There are numerous adaptors available for a few dollars which accept two PS/2 inputs for keyboards, mice and trackballs and connect them to a computer via USB. I bought several and found they were flaky (occasional extra keystrokes) and/or didn't work on a Linux machine. In my experience over the last week the StarTech USBPS2PC has performed faultlessly. I am only using it with PS/2 keyboards. I found that a keyboard can be plugged into either the keyboard or the mouse connector, and that it works fine with two keyboards plugged in. It works fine under Linux and even with the BIOS of the computer (NUC7CJYH). Under Linux it appears (lsusb) as a "046d:c52b Chesen Electronics Corp. PS/2 Keyboard+Mouse Adapter". Mechanically it is much more robust than the cheaper three-lead adaptors. The electronics is molded into a solid plastic box which anchors well to the cables via flexible strain reliefs - which are also on the molded connectors. I wasted a lot of time with errors from cheaper devices in the past and am glad to have found an adaptor which appears, so far, to be rock-solid and to work in all settings.Read full review
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