QANBA 2009 ARCADE Installation Manual page 21

Tournament mode
1. Tournament mode switch (5) When unlocking (default),
compatible buttons A/B/C.D and function buttons
HOME/SELECT/TURBO can be used normally.
2. When the Tournament mode switch (5) is locked, the compatible
button A/B/C.D and the function button HOME/SELECT/TURBO are
unavailable.
Tournament mode Tournament
lock On mode lock off