Thanx for you reply.
I have even better alternative.
The CIC came from an ancient dead DMM
I have another old crappy based on the 7126 which probably needs
to be replaced. I can try... but murphy said that checking it first is good ...
The datasheet would clarify some doubts... as I have already heard
that CIC cloned the 7126 without permission... some time later it vanished.
so far no datasheet published... or yet or never available.
I will sleep on that testing bench gig..
I have just ONE salvaged chip
one shot
Paul