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Umk3 cmos

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Bustel:
hello everyone
I have a umk3 pcb revision 1.0 ,rom test all roms green and then cmos invalid put a new battery and batteryholder still the cmos reset ,if you push the reset button on the board game restart and cmos ok ,
If the arcade turned off you have the cmos invalid ,can anyone help me with this problem
Thx

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