LK421
The LK421 was a detachable computer keyboard manufactured by Digital Equipment Corporation of Maynard, Massachusetts and supplied as an option to the standard LK401 keyboard with their DECstation workstations. The keyboard is optimized for use with the Digital Unix line of operating systems, instead of the OpenVMS operating system for which the LK401 was more suitable.
The keyboard is notable for the standard position of the Ctrl key for use with Unix operating systems and an Esc key. The keyboard has two Compose keys.