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With the board in the Amiga and powered on, what is the voltage at the RTC chip? It needs be within usually 2V to 6V. If it is out of range - i.e. if it is higher than 6V the RTC chip with not work.
I just found this out with one of my memory expansion cards. With the battery removed and card plugged in and powered by the Amiga, the RTC chip was getting 8.1V, due to the 12V source.
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