Before you hit up the 29 wire chip, check the signals on the LPC. Make sure they're all present and correct. Check the d0 points, make sure they're clean. Check for any other components that might have been knocked off. If its all good, try booting each of the 4 256k bios one at a time. Here's hoping one of them will work.
bank 1: ground a18 and a19
bank 2: ground a18, 3.3 a19
bank 3: 3.3 a18, ground a19
bank 4: 3.2 a18 and a19
-Duck!