VX/TDMS supplies all features of the original OpenVMS system. Supported features include, but are not limited to:
Double-wide, double-high characters
VX/TDMS supports all VT-terminals (VT100 or higher) and DECwindow’s DECterm. VX/TDMS is a fully functional implementation of OpenVMS TDMS and can be run as a stand-alone product. For programs that take full advantage of VMS, VX/TDMS is designed to be fully integrated with VX/RT
— Sector7’s VMS run-time support libraries for Linux/UNIX.