Thank you Crow, actually i did mention that one in my sources for collecting infos, but indeed i didnt go thru all the detailed explanations about the LSI's functions...It is true that i opted for a quicker approach like just listing values, but surely it's a bit more complex than just that.
Gonna go into it deeper tonight, and collect more infos for sure that way :-)
About those IG series circuits, did you manage to get what you hoped for?
best