While I'm on the subject, here's a screenshot of a special prototype version of FreeSSM with OBD1 SVX support. There is still a lot of work to do, but the basics are there. I've offered to help Frank with getting the OBD1 stuff finished and working. It will support not just the ECU, but also the TCU and maybe A/C and 4WS units. OBD2 should work already.
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Subaru ECU and TCU Website
1992 Alcyone SVX Version L
1992 Alcyone SVX Version L
1994 Alcyone SVX S40-II
2004 Subaru Legacy 2.5 SE Sports Tourer
1996 Subaru Legacy 2.2 GX Wagon
1988 Subaru Justy J12 SL-II