Ontel 8" floppy disc drives cabinet

Probably from an Ontel OP-1 system in the late 70's or very early 80's. The OP-1 was somewhere between a configurable terminal and a dedicated word processor depending on firmware and peripherals installed. Peripherals did include 8" floppies in the high end, I saw this being used in car dealerships back in the early 80's as the front end to a central-office PDP-11 system. There are at least a few other manufacturers that used 8" floppies on a DB25 cable. E.g. the RX01 cabinet kit for a WPS-8 system. I would not expect to find any of them using compatible pinouts or even "interface concepts". E.g. the RX01 is a dedicated serial bus with some smarts (or at least a state machine) at the drives. The DSD-440 line used a different dedicated serial bus (26 pin ribbon cable IDC's usually but I think I saw it routed over a DB-25 at least once) and a microprocessor in the drive. I'm guessing your board that sits between 50-pin Shugart and 25-pin connectors, doesn't have much smarts, it probably just drops the many unused signal lines and consolidates many of the grounds.