VecVox is a hardware extension for the vectrex which can be plugged into port two joystick port.
It was designed and build by Richard Hutchinson and gives programmers access to a SpeakJet speech chip. The hardware can still be ordered and is now known as AtariVox+, but using dipswitches
it can be used as a VecVox
or configured to emulate VecVoice
It can be ordered at https://atariage.com/store/index.php
Note:
You additionaly need a joystick cable extension, since the cartridge because of its design does not fit directly into a vectrex!
The speech is emulated by using samples.
The Datasheet of the chip can be found in the subdirectory:
documents/hardware/speech/speakjet-usermanual.pdf