non-rx2 rc car hacking

Hey all,
I bought an RC monster truck hoping to make a line-following robot using the well-documented RX2 control method, but was unpleasantly surprised to find a completely different control board in the truck. Photos attached, I hope.

Even worse, the RXD is chip-on-board so I have no way to identify it. Googling the other text on the circuit (P15S02, D0-9712-12-SNTC VERA, etc) came up with nothing. Can someone help point me in the right direction?