Big Trak (1979)

Released in 1979 by Milton-Bradley. There was a 2010 re-release, but this is one of the originals. This battery-operated toy vehicle is programmable. It stores up to 16 instructions that it will carry out in sequence. The actions are: move forward, move backward, turn left, turn right, flash the lightbulb and make pew-pew noises, or trigger the accessory cart to dump it's contents. Except for the accessory command, "OUT", each action button press is followed by a number representing the amount to move, or the number of times to "fire". Pressing "GO" starts the sequence, pressing "CLR" erases the program.

This one is on indefinite loan from a friend. It required some minor repairs. I re-attached wires for the speaker and microphone. One of the tire grips, one screw, and the lightbulb, have been replaced with matching parts. I 3D-printed a new top battery-cover and a peg to hold the left-rear wheel on. The main vehicle is now fully-functional.

Unfortunately, the trailer mechanism has been destroyed by battery leakage.

Parts

Lamp	#222, 2.25v (McMaster-Carr 1505K41) [1]
Screws	#4 (4-24), 3/8in pan head screws (McMaster-Carr 92470A108) [1]
Tire Grip	#232, 1/8 inch width, 2 3/4 inch inner diameter, rubber o-ring (McMaster-Carr 9452K161) [1]
Battery Cover	Base (prints tabs-up, with supports), Handle (print filleted-side up, no supports) - they attach with M3 screws and captive nuts.
Wheel Peg	Source file (you will likely have to adjust the lengths) The rendered piece I used (prints on the wide end of the rod, no supports)

[1] originally found by Robot Room