Strange behaviour with MATDIM (Advantage ROM) on NoV-64D

[emefff]

That I do not suppose, otherwise there would be a lot of other stuff going wrong? And, aren't these numbers assigned by the config software or the HP41?
Oh, by the way, the "?" is not part of the output, that should have been an emoji.

When I enter program mode I first do a "GTO .."
Then, without a label I type "XEQ DIM?", the calc shows me "01 DIM?" which seems correct. Did you have that in mind?

When I turn off the calc and remove the NoV-64D and I change to PRGM it indeed shows me "01 XROM 22,18"

I attach my setup of this module, I suppose it is ok. Been using the same banks for a long time.

Mario.