yes, nikon non-ai (or someone call pre-ai) lens has to be modified to ai mount, it can then be put on a modern nikon DSLR, with center weight metering and aperture priority (A mode), as well as focus confirmation light (for mode D200 and above), on some pro gear 仲有光圈連動 (i.e. the aperture that you chose will be showed in the LED of the viewfinder).
i bought the lens which are all being modified to Ai mount.