VecVoice 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 SP0256-AL2 speech chip.
VecVoice is not available anymore, since the used speech chip is not fabricated anymore.
The speech is emulated by using samples.
The Datasheet of the chip can be found in the subdirectory:
documents/hardware/speech/Sp0256al2 datasheet.pdf