I'm willing to take the risk trying to modify i1disp.c, unless you positively know, that it will not work. So that's my question.
Anything is possible, but it means reverse engineering more of the Sequel/Gretag library for that instrument. I didn't see any point in doing so, without an instrument to observe operations of, and check functionality against. A snoopypro trace of the instrument being opened, configured and making readings would be a first step. There is a great deal of similarity between the different model instruments, but the details vary. Graeme Gill.