Trying to get at that electronic interface? Well, there’s no point in trying any harder to search the Internet for documentation on that interface. No, that is private knowledge only found in the heads of camera repairpeople who have been working on that technology at the time. So, that problem aside, let’s look toward reverse engineering the interface.
20180318/Google reverse engineer electronic communication interface logic level 5 v
Oh, this is really helpful, but it only scratches the surface, with an emphasis on modern devices.
20180318/http://resources.infosecinstitute.com/reverse-engineering-of-embedded-devices/
Not so helpful.
20180318/=https://www.element14.com/community/thread/37817/l/reverse-engineering-old-serial-devices-and-cloning-with-arduino?displayFullThread=true