BIG TRAK / bigtrak is a programmable electric vehicle created by Milton Bradley in 1979, resembling a futuristic Sci-Fi tank / utility vehicle, possibly for use on the Moon or a Planetoid style environment. The original Big Trak was a six-wheeled (two-wheel drive) tank with a front-mounted blue “photon beam” headlamp, and a keypad on top. The toy could remember up to 16 commands, which it then executed in sequence. There also was an optional cargo trailer accessory, with the U.K. version being white to match its colour scheme; once hooked to the Bigtrak, this trailer could be programmed to dump its payload.
In 2010, BIG TRAK was relaunched in the form of a slightly modified replica (cosmetically very similar to the original U.K. bigtrak), produced under licence by Zeon Ltd. There is also a small dedicated Internet community who have reverse engineered the BIG TRAK and the Texas Instruments TMS1000 microcontroller inside it.
Info gleaned from Wikipedia