given this is the case is it possible to connect the lindbergh to the chihiro/naomi (sega not namco) force feedback board? if so what kind of converter would need to be made?Interesting, I've been working on the RS422/232 version of the Sega servo motor board, and the data is the same - just different protocol.
Basically seems these boards need the following:-
SUD_FFB_RESET - Reset point, from here you'll see if the board is hooked you either get an ACK or not
SUD_FFB_INIT - Setups some parameters, then it will spam the poll command (0xFD,0x00,0x00,0x7D) until ACK is 0x00 (this is what I call the warm-up servo process, even Afterburner Climax motion does this on boot)
SUD_FFB_ROLLLEFT - Rolls the wheel left (it's a FULL process, does not need to be Poll'd)
SUD_FFB_ROLLRIGHT - Rolls the wheel right (it's a FULL process, does not need to be Poll'd)
SUD_FFB_INIT_CENTRE - Centre point is found by slowly moving the wheel back from the right until as close to centre (0x7f/80) can be reached, this is read from either the JVS analogue  so you need to poll JVS at the same time as this has no concept of game position.
SUD_FFB_INIT_PACKAGE - Used by Grid only?
SUD_FFB_SEND_PACKAGE - Used by Grid only?