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Press the SW1 button repeatedly on the main board until the main
display reads ‘P86’. If you get too far on this menu you can always
get back with the SW2 button.
Using START button on the front of the machine set number of
hours (counted from the last resetting) after which the highest score
should be reset automatically, eg. set 120.
Then press the SW1 button once - the main display should read
‘P87’. Using START button on the front of the machine set number
of minutes (counted when machine is in idle state after the time set
in P86 above has already passed) after which the highest score will
be reset, eg. 15.