For a VERY short period with Birdseed, I was tasked with getting up to speed on the 80p as tech instructor. Spent a couple of days at Glasgow being mind-boggled by the peculiarities of the beast!. Very little detail remains, save for the fact that the ADF display was presented as a displacement bar on the PFD. That struck me as distinctly odd, given the irregular nature of the input. Visions of 'wobble-eyed' NPAs! Thankfully, the assignment was cancelled before 'going live'!