r1 - wired only for the jump to num lock

r3 - b1 = 1
b2 = 2
b3 = 3
b4 = 4 [left player 1]
b5 = 7 [right player 2]

r5 - b1 = tab
b2 = f3
b3 = t
b4 = y
b5 = [

r6 - b1 = a [action / fire button player 1]
b2 = s [start player 1]
b3 = d
b4 = f
b5 = j

r8 - b1 = z [up player1]
b2 = x [down player1]
b3 = c
b4 = v
b5 = m