Completed the directional control circuit. Tod has his relays mounted on the circuit board, mine are instead attached to the support bracket immediately to the left of the circuit (not visible in photo). Visible on the top right is the emergency shut-off switch for the speed control circuit.
The directional control circuit is mounted on the rear side of the triangle frame.
"How to build a computer-controlled robot" (amazon)
1977 Interface Age Article (pdf)
ZagrosRobotics
.nu