Classic controller PCB, Top view
Classic controller PCB, Bottom view
Chip listing:
U1: Unknown manufacturer - "FNURVL" "A 405" "629KM" (custom processing chip? - TQFP48)
Other interesting things:
5 pins seem to be used from the data cable, in a 6-pin header (These numbers match the numbers given on the Wiimote PCB)
More information on the data cable and communications with the Wiimote can be found at the Wiimote Accessory Bus page.
interestingly enough, the 2 analog sticks are mounted in opposite orientations...
the logic/control chip is roughly identical to the one on the nunchuck, the text only differs by 2 digits. ("629KM" instead of "633KM") | 
