The keyboards that are used with the DEC terminals (before the vt520) are rubber domed membrane keyboards, and aren't the most enjoyable typing experience. The DEC LK401 is the standard keyboard used with the vt420, and uses a custom RJ11 connector with RS423 to interface with the terminal.
The goal of the project is to create a scan code translator (using an arduino) which will read PS/2 scancodes from a contemporary keyboard, and translate those to scancodes that the vt420 will accept.
Fri 27 Nov 2020: Started collecting information on what is needed for the project