Just use something like Pheonix to put a simple Comms program into the F84 for PortB.7 (not PortB.0 as in your code at Post #2 above) to talk to your F628, then it's just dialogue between the two to determine what you want to do... ie put Data into the EEPROM, or read back/compare etc.

Start by simply sending ONE character from your F628, receiving it on the F84 card, and sending it back a few milliseconds later. Once you have managed reliable communications between the two, you can then build on that and add features.