I think we were in the crossover period about year 2000, so may have been a voluntary thing on Subaru's part back prior to year 2000.
I am wondering if anyone has an updated method of tapping into the SSM to read all the live data available via the SSM port - there are some old posts talking about free SSM and using a serial port for laptop input. I no longer have anything more than USB input, so might expext a serial port adaptor to USB ??? Mind reader adapter would be better