If your ECU is upto 1995 then we can do (Type 4) B14 SR20DE ECUs no problems. This is listed on our boards page at
NIStune - Nissan Realtime ECU tuning
The later model 1996+ ECUs I'm still working on. Those later model ECUs have the OBD-II code in separate memory, so we are working on a OBD-II version of the Type 4 board which is compatible with 1996+ ECUs.
(We have the board layout ready and getting quotes for prototypes to be built at the moment)
A few people have asked me if Nistune boards would support TunerCode ECU extensions and the answer here is that I see no reason why we cant. We would just take the TunerCode BIN file and add our realtime tuning consult extensions to the firmware and then program it to the board
However it wont have the auxillary I/O boards that the Calum 2.0 RT boards are capable of, but all the other things like switching stuff off and RPM extension will work in any board. Hope that helps!
matt