Zaɓar tsarin ƙirga
Kowane maɓallin tsarin ƙirga yana sauya lambar da ke kan allo kuma yana canzawa zuwa wannan tsarin. 
yana canzawa zuwa tsarin biyu, allo kuma yana nuna ƙaramin b. 
yana canzawa zuwa tsarin biyar, mai alamar P. 
yana canzawa zuwa tsarin takwas, mai alamar o. 
yana canzawa zuwa tsarin sha shida, mai alamar H. 
kuma yana komawa lambobin al'ada, alamar tsarin kuma ta ɓace. Cikakkun lambobi kawai ake amfani da su: ana yar da ɓangaren bayan ɗigo, lambobi masu debe kuma suna fitowa a matsayin complement.