Well, shoot. My programming cable doesn't fit.
I realize now that I bought the cable for the 5V and 3V "plus," but I only got the 3V radio, not the "plus." Other than the different plug config, I'm not sure the difference between a plus and a non-plus.
So I just ordered another cable, the non-plus cable. In hindsight, I should have got the 3V-r plus, so I could have used the same cable for it and the 5.
82 fj40, 99 uzj100, 06 gx470
97 DR650, 05 525EXC, 06 TW200, 89 TW200, 09 TTR125, 07 TTR90, 07 CRF50