This was talked about on the other board (can't find the thread!) regarding how the memory chip in the digi cluster could be reprogrammed with a new odometer reading. But no datasheets on the chip could ever be found.
But here is an interesting read for the patent on the odometer, including a little info on the chip, its a whopping 336 bits big! It can also only be written to only so many times, so the patent describes the extra effort to minimize data writes and ensure data integrity. I have verified that during run, the memory does only get written to every 10 miles or so as the patent describes.
The Odo Patent (http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=/netahtml/srchnum.htm&r=1&f=G&l=50&s1=4803646.WKU.&OS=PN/4803646&RS=PN/4803646)
Or goto http://www.uspto.gov and search for patent 4803646
Click on IMAGES to see the whole patent.
I wonder what other things on our cars have patents? :)
mmm, thats explain why my digital odometer resets every 16 Km to the old value (46078.9) and never increases.....
(http://usuarios.lycos.es/racingtrykes/almacen/Cougar.jpg)