well since no one else had the answer I found a way to test the mapping so here it is for anyone else who needs it:
P1 (Mame Defaults)
Start -> 1
Coin -> 5
U -> up arrow
D -> down arrow
L -> left arrow
R -> right arrow
B1 -> Left Ctrl
B2 -> Left Alt
B3 -> Space
B4 -> Left Shift
B5 -> Z
B6 -> X
P2 (Mame Defaults up through button 5)
Start -> 2
Coin -> 6
U -> R
D -> F
L -> D
R -> G
B1 -> A
B2 -> S
B3 -> Q
B4 -> W
B5 -> E
B6 -> D
So it appears that player 2 button 6 is mapped to player 2 left joystick. @Dreygor how are you running any 6-button 2-player games like this?
P1 (Mame Defaults)
Start -> 1
Coin -> 5
U -> up arrow
D -> down arrow
L -> left arrow
R -> right arrow
B1 -> Left Ctrl
B2 -> Left Alt
B3 -> Space
B4 -> Left Shift
B5 -> Z
B6 -> X
P2 (Mame Defaults up through button 5)
Start -> 2
Coin -> 6
U -> R
D -> F
L -> D
R -> G
B1 -> A
B2 -> S
B3 -> Q
B4 -> W
B5 -> E
B6 -> D
So it appears that player 2 button 6 is mapped to player 2 left joystick. @Dreygor how are you running any 6-button 2-player games like this?
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