Have you looked at the DATASHEET for the 16F84?

If you haven't please download it from the Microchip website.

The size for the on-board EEPROM for any PIC is usually found on Page 1 of the Datasheet. You can determine if it is sufficient for your needs from there.

Please Look at the DOCUMENTATION for the EEPROM command. You can only play with BYTES... therefore...

EEPROM 0,[$0C,$0D]

or

EEPROM 0,[12,13]