The SB-28DX will not do the iTTL automatic flash that the current (last ten years) DSLR can do. Film TTL and early D-TTL flash is very different than todays iTTL.
But you can still use it in flash Manual mode, no issue. It will still be as useful as any other manual mode flash. For another remote flash in a manual flash situation, you could add an inexpensive Ebay optical trigger to its foot (see
Optical slave triggers for speedlights )
And you can still use it in flash mode A (non-TTL auto mode), no problem, except that it cannot access the ISO and fstop numbers from the camera hot shoe (flash is not CLS, no bets on that data transfer working). But you can set these camera settings manually into the flash, and then that mode still works too. (so long as the settings don't change in the camera).
Just no TTL.