HP-41C IL Module Question

[Sylvain Cote]

It took some time but with Dave example I finally understood your question, sorry about that.
Dave is right, to my knowledge XROM cannot be parameterized.
The only way I can think would be through polling point like CCD or ZENROM did and even then, their behavior extensions were not programmable.
The best ones to answer that would be Ángel Martin, Håkan Thörngren or other MCODE guru here.