OK! I’ve a zynaptik with all the parts soldered on it:
The second 40-pin connector is the “zynaptik connector” and has this pin-out:
Where:
- GPAx & GPBx are digital input/output pins (MCP23017, at I2C address 0x21)
- INTA & INTB are interrupt pins for banks GPAx & GPBx, connected to RBPi pins 36 & 37.
- AD-x are analog input pins (ADS1115)
- DA-x are analog output pins (MCP4728)
I will copy this info to the wiki ASAP 
Regards,