14 bit address bus....
8 bit data bus...
2 bit chip and output enable.....

Lots of pins already, but it could be done. You would need to monitor the OE and CE pins and then read the address and put the appropriate byte on the data bus.
It might be easier to write or find some software to change the settings you are interested in and then write back to the rom. It is fairly easy to make a simple programmer for these devices.

Do you know where the data you want to change resides on the rom, which addresses? You could use a pic to program just those addresses with the new bytes you need.


Paul