Hi,
You can't just say DATA 840 since that is larger than what fits in a byte.
Are you sure the LCD said 74 and not 72? 840 in binary is 1101001000, look at the 8 least significant bits (marked in red), that's what will actually fit within the byte in EEPROM. It says 72.

As been written previously you need to use the WORD modifier to store a WORD in EEPROM, and then use it again to read it. Or read the high and low byte "manually" after figuring out in which order the DATA statement stores them.

/Henrik.