MBX Expansion System

The MBX began life in 1982 as Milton Bradley's answer to the Atari 2600 and Mattel Intellivision — a standalone game console built around voice recognition. MB planned to differentiate with voice input, speech synthesis, and a unique controller. The project was led by Mike Langieri. When ColecoVision entered the market, MB president Jim Shea decided the market could not support four consoles and killed the project. Langieri was then tasked with finding a use for the developed technology. The system was retooled as an add-on for the TI-99/4A, a computer for which MB had already developed games and whose graphics chip (TMS9918) MB had some connection to. The MBX was demoed at the January 1983 CES to lines of waiting attendees. Atari was so impressed they entered an agreement for MB to produce an equivalent system called the Voice Commander for the Atari 2600 and 5200, though this deal eventually fell apart.

The MBX offered three simultaneous interaction modes. Voice: A headset with adjustable boom microphone fed speech into a recognition system. Before each game, the user trained the system by speaking displayed words; the system created a voice model and then recognized spoken commands during play. Different games used different vocabulary. The joystick: A pistol-grip controller with 360-degree analog directional control (not limited to 8 positions), proportional speed (faster stick movement = faster on-screen action), a twist knob on top for continuous object rotation, and four buttons (three on the back plus a trigger under the lever). The keypad: A 64-button membrane surface with swappable plastic overlays specific to each game, providing labeled one-touch commands. None of the cartridges used ALL the MBX facilities, and the joystick was never fully utilized by software.

The MBX unit was effectively a second computer that used the TI-99/4A for game storage and video display. It contained a 6809 CPU running at 6 MHz and a General Instrument SP1000 (GI8335) speech synthesis chip. It connected to the TI-99/4A via the joystick port and cassette port, using a custom serial protocol. It had its own 9V DC power supply. The headset featured padded ear rests (not headphones — they were purely for comfort) and a boom microphone that could be positioned 1–2 inches from the mouth. The joystick used analog sensing for position and speed. The system was manufactured from approximately September to November 1983 (control numbers MB8309–MB8311).

The MBX's joystick design lived on: a simplified version (without the twist knob or analog control) became the Atari Space Age Joystick and was also marketed by MB as the HD2000 Joystick. The voice-training paradigm — speak displayed words to calibrate the system — presaged modern voice assistant setup routines by decades. Barry Boone later produced assembly code allowing Extended Basic programmers to access the MBX's facilities. About 10 cartridge titles were released, including Championship Baseball (the flagship), Space Bandits, Bigfoot, Sewermania, and Terry Turtle's Adventure. The system remains a cult object among TI-99/4A collectors and an extraordinary what-if in gaming history: a voice-controlled game console killed by market timing.