External EEPROMS are great for storing data, and to interface with them is not all that hard. Most use the I2C protocol. In this example the 24LC256 is used. I2C communication is great as it can allow serial data communication between many devices on a single 2 wire bus. These two lines are referred too as SDA and SCL. Basically SDA is the serial data and SCL maintains the clock/frequency in which data is transferred.
http://digital-diy.com/swordfish/59-swordfish-tutoriallibrary-external-eeprom...
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