You have established that your bus is working correctly, and that the eeprom is ok.

A0..A2, WP are all hard-wired to GND.

I would assume that you have identical software on each chip. I also hope that you are checking the ACK when you address the Slave. Although the Slave_Read_Ads is obviously responding ok.

My only thought is that the bus is not free when your 668 is trying to access. Again, you should always check for a free bus EVERY time you want to start a transaction.

David.