Appearing around 1988, a generation consisted of the VT320, VT330, and VT340; after a few more years, the VT320 and VT330 were replaced by the VT420, with the VT340 kept in the product line for ReGIS graphics applications.
Appearing around 1988, a generation consisted of the VT320, VT330, and VT340. The VT320 and VT330 were replaced by the VT420 in 1990, with the VT340 kept in the product line for ReGIS graphics applications.