I have used serial EEPROM too.

If you take a look on the software page of my web site, there is a little library of assembler routines for driving them.

These routines originally came form the Atmel site, but I have modified them so that you can also use them with the larger seial EEPROMS such as the Xicor X25320.

See http://www.bigfoot.com/~dave_fletcher