Another divide down hammond emulator. BX-3 is dual manual version. Considered a bit of a classic in that realm. The newer version is all digital of course. The old version uses a TOS 50241 as with the other poly keyboards of those years like Delta and Lambda. As well as the same keys. The divider chips and keyers are unique though in order to give the flexibility with the odd footages I suppose. In summer 2001 Mika Tyrvaeinen (Finland) and me Thomas Richardon (Germany) studied the funcions of old CX3 via e-mail contact. I have a document they provided with .gif files of diagrams nicely done! I assume probably that is still available somewhere but oldschool is no more. Perhaps the new link is adequate. I haven't looked. Let me know if not.
Never had to work on one. The document I'll just link here
Korg has keys and may still support these with some other parts but beware there is a newer version of it that uses different keys for instance. I have some older ones. Contact