Berzerk only uses one 8-way joystick.
For games that use two (Crazy Climber, Cloak and Dagger, Space Dungeon, Black Widow, etc...) there are settings for Player 1 Right/Up, Player 1 Left/Down, etc...
Just set those to whatever your Left Stick and Right Stick are.
Cloak and Dagger also needs a fuse lighting button.
Set that to your topfire, if you have one.
If not, any other button will work.
It is used to manually light the fuse on the bomb before exiting the level.
That will help you get higher scores.