Last time I saw XP in the wild (i.e. not reported by El Reg), it was also a self-checkout at US hypermarket chain Meijer. I know the local Ace Hardware locations also use a Windows-based POS, but I don't know which Winver.
I don't understand why NCR and
the lot their peers bother to use anything so bloated when an R-pi properly configured could do the job. (Someone correct me if I'm wrong, please.)