I don't know of another ROM tuned J4 ECU, and you wanted to see the guts of the ECU. It's the model found on the last generation 180SX (96.5 - 98). The wiring pin-outs are most similar with the E5 / 62 style earlier S13 SR ECU's but there are some variances.
Look like something you could readily adapt the Realtime software to?
Anyone else have any comments, or know who might have actually tuned this engine before? Electronics aren't my strong point.