Originally Posted by peterjcat
Discovery! As we suspected, the first bit does seem to control PAL/NTSC, and the last seven make up the official code number. So 11=France NTSC, 91=France PAL, 14=North Africa NTSC, 94=North Africa PAL, 01=Canada NTSC as already reported, 81=Canada PAL, 02=Mexico NTSC, 82=Mexico PAL, and so on.
Yes, I made the same discovery tonight. I'm sorry you beat me to it!
Another, smaller discovery: If you perform a Factory Reset by hitting PAUSE while viewing the System Information screen, the first two bytes of the EEPROM (the country letters) and the high-order (PAL) bit of byte 4 get changed to the default values for the model identified in the low-order bits of byte 4.
For example, I had my EEPROM set to 43 41 00 80..., which is:
(I was testing robertpierre's reported initial EEPROM string, which combined the "CA" letters with the USA model code, but I also happened to have PAL turned on.)
When I did a Factory Reset, it changed my EEPROM string to 55 53 00 00..., which is:
In other words, it "corrected" the country letters to "US" and disabled PAL, based on the model encoded in byte 4.
I discovered earlier that the factory reset also restores the DVD region, undoing the effect of the RMTM CD, presumably also based on the model encoded in byte 4. (I have only tested that the 01 Canada model code will reset the DVD Region to 1. Perhaps others can test their own countries.)
The DVD Region setting is evidently stored elsewhere, perhaps in an EEPROM built into the optical drive unit, which the program on the RMTM CD is manipulating somehow. Does anyone here know how that program works, or have the source code? Perhaps the BD region is handled similarly (or completely differently, in order to give us new challenges)?
The fact that the DVD and BD region settings are not listed in the "Player Option Information" section of the System Log is further evidence that those quantities are not directly encoded in the EEPROM string, and that achieving complete "BD Region freedom" will require poking elsewhere.