I know this post is 4 years old but i just found this board lying around myself and recognised it as one of the boards from Cybot and i thought for the sake of completeness i ought to post an answer!
See this site for details:
I remember taking this out when the board was upgraded (to one with a little ceramic capacitor and the microchip in a socket rather than soldered directly to the board), and the new board/processor was faulty so i had to get it replaced.
it's the IC on the top right corner, i have one to but it only says U8459-AF101 the numbers after your ''and'' are diferent not very diferent though... it came in thid DIY robot that i built when i was 9, it kinda works still but the right side is blind... i was trying to figure out what was wrong with the IC and saw your post on my favourite site