My guess is there's some vss counter stored along with the odometer. Interesting tidbit there, might help us determine how it's being stored.
I'm making progress slowly. Have many of the digital inputs mapped out to the I/O ic. By the way, does anyone recognize what this might be? I'm not finding much of use when I search for any of the numbers on it. Most of the digital inputs and outputs seem to be handled by this piece.
whats-this-ic.jpg
While mapping out the arm utd pin, I discovered that the upper byte of $644b seems to contain the state of the alarm. I also found that this seemed to survive a power loss, and discovered that it indeed somehow relates to $7105 (RAM) and $b705 (EEPROM).
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