If you want a PC cord for manual operation, then any male-to-male PC cord will work between the SB-24 and the AS-15. Most PC cords are male-to-female or mini-to-male or something else that wont work, but male-to-male does exist, like this oneI have an AS-15 adapter on my D50 and would like to get a PC cord so I can use my SB-24 off camera.
What kind of cord should I buy? Please be specific. I posted this question on Strobist and can't seem to get a good answer.