DDC hasn't been plain EDID EEPROMs in years. Nearly everything is DDC-CI now, where the scaler chip _pretends_ to be an EEPROM in the initial negotiations but

DDC hasn't been plain EDID EEPROMs in years. Nearly everything is DDC-CI now, where the scaler chip _pretends_ to be an EEPROM in the initial negotiations but there's a few magic "memory locations" that change each time you "read" or "write" to them, and a full bidirectional protocol layered on top of that. This allows arbitrary sized message transport, reflashing of the monitor firmware, and all sorts of goodies. And baddies.