DEC VT 330+ is a successor of VT330. My device has latest date codes from week 28 in 1990, so it is about 1990 or 1991. The electronics differs from the VT330, the digital logic part is build on a single PCB only. While older VT330 were built on two boards. This newer board has an Intel 8032 8-Bit CPU, 2x128 KByte EPROMS (27C010), 2xHM62256 2x32KByte RAM. The microcontroller has two companion chips SCC2692AC1N40, these are dual asynchronous receiver/transmitters.