I measured every single pin of the memory expansion connector and every pin is connected to correct chip pin (sometimes via resistor). I was hoping for simple broken trace or something, but no.
However I also found out that while A604n is connected then _RESET is being held to ground all the time. Explains why I get black screen only and no leds. But why that happens? Is A604n keeping _RESET grounded or is it some Amigas own circuitry?
Need to study schematics more...
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