Bigtrak

BIG TRAK / bigtrak was the programmable electric vehicle created by Milton Bradley in 1979.

It was a six-wheeled tank with a blue 'photon' beam and a keypad on top. The toy could remember up to 16 commands which it then executed in sequence (such as "go forward 5 lengths", "pause", "turn 30 degrees right", "fire phaser" and so on. There was a "repeat" instruction allowing simple loops, but the language was not Turing complete.

There is now a small but dedicated Internet community who have reverse engineered the Bigtrak and the Texas Instruments TMS1000 microcontroller inside it (see external links).

The US and GB/European versions were noticibly different. The US version was moulded in gray plastic and labelled BIG TRAK whereas the GB version was white and labelled bigtrak with a different keypad.

Bigtrak also included an optional trailer accessory. Once hooked to Bigtrak, this trailer could be programmed to dump its payload.

Programmable Keypad

All programming to BigTrak was done through the keypad shown here. There were no LED displays or ways to display program instructions, beyond actually running the program, which was done by Pressing "GO". Other function keys included:

Forward/Backward: Move forward and backward
Left/Right: Turn the specified number of degrees in that direction
HOLD: Pause for a number of seconds (GB version; P: Pause)
FIRE: Fire the LED "laser" (GB; Photon Symbol)
CLR: Clear the program (GB; CM: Clear Memory)
CLS: Clear Last Step (GB; CE; Clear last step)
RPT: Repeate a number of steps (primitive loop) (GB; x2: Repeat key)
TEST: Run short test program
CK: Check last instruction (GB; Tick symbol)
Out: Dump optional trailer accessory
In: Reserved for future expansion (GB; missing. Disabled on most if not all BigTraks)

External links

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