Users are able to develop their own interface routines, and substitute new vectors for the original vectors in the startup UV-EPROM. This  seamlessly maintains the normal operation of the board's monitor and languages such as Synertek Systems BASIC.
End-users have the ability to craft their own user interfaces, and swap out new values for the original ones in the initial UV-EPROM programming. As a result, the board's display and programming languages such as Synertek Systems BASIC remain operational.