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"Since the original battery is dead by now (it is soldered in, and so I could not easily replace it myself), the User patches from 000 to 199 have no patches loaded. You would have to replace the CR2032 battery to get the User patch locations to hold any patches you copy or load to that range after the unit is powered off. This should be done by an experienced service technician, or a capable hobbyist. I don't recommend doing this yourself if you are not experienced with electronic board soldering, since you don't want to take a chance on damaging the circuits. There are some internet postings showing a recommended installation of a new battery holder, one that will allow easy changes of the battery in the future.
The ROM chip in this unit is the last Oberheim factory version 1.11. Hobbyists will probably want to pull that chip and replace it with the 1.16 or 1.20 versions that you can find for sale here on Reverb. But the updates in these new ROM versions are primarily for improving the unit's real-time response to certain external sysex change requests. They do not affect the basic operation of the unit during live playing, as far as I know."
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