| 摘要 |
<p>A plurality, e.g. three or more machines 10-14 are associated, and also associated with a display device located as a top-box 18. Each machine 10-14, and also the top-box 18 has a fully independent controller 20 with its own timer 21. The respective timers 21 are however synchronised by use of a common time reference signal 23, so that events determined by a respective event list 22 in the control program can occur in all the machines and the top-box at the same time. A sensor 24 determines if the machine is in use, and 25 if there is sufficient funds, so that an event such as a bonus prize can be given by all machines in the group which are in use.
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