The order of the male DIN plugs match the order of the pads on the ground:
L to R: PCE Master Blaster 3-button, White PCE Turbo, Core Grafx, TurboDuo, TG-16.
NOTE: the plastic housing for TG-16 is *not* bigger than the PCE counterparts...it’s an illusion due to the DIN vs. mini-DIN...
...again, it looks as if you could use the square-ish PCE plug for the BattleTap, but you can’t use it (and I tried to jam it in there like a fool one day).
Not surprisingly, the BattleTap itself uses the “tiny round” plug (seen adjacent to Tap).
NOTE: I use a TG-16 —> PCE adapter to use the TG-16 pad with BattleTap.