Oui, ce sont les dipswitchs de la carte-mère.
Et pour la documentation, voir
ici To set the Dual (or single) monitor boards to free play, set the dip switches on the Playchoice motherboard to the following settings:
A-F = off
I-O = off
P = on
Optional:
For attract music = G on/off
For self-test = H on/off