I almost did a multi chip robot. The plan was to have two 'half' brains. The left chip controlled the left side of the bot, and the 'right' chip controlled the right side. They would both get the same program too, but a jumper on an output pin would tell one chip to invert its sensing and ouput. No communication would be needed between them.
If you cut a human brain in half (between both lobes), a person will still have 99% of their functions.
Its kind of hard at first to see how this will work, but it would . . .