[Coco] Floppy controller - 7416 failure symptoms?

[Mark Ormond]

Still trouble shooting floppy problems and was wondering if anyone can tell me type symptoms that failing 7416 chips would have in a controller?
It's a fd500.

Also on the fd500 note, does anyone know of a way to add the missing cart connectors? (Pin 37 actually, I need a13.)

I was thinking maybe a rear defroster repair kit to make a contact with 30g kanar wire painted in and super glued running to the rom?

Later,
dabone