HP 41CX Halfnut CX EXT FCN missing

[HPnerd]

Thanks Bill,
You did make my day :-)
i did not loose any thought about the display-pcb to hold any ROM...
so i have to completly remove the key-pcb again to change the display-pcb :-( but i think it is worth to do so :-)
Thanks a lot for this value information, again best regrads from Austria
Walter