I have your S-DD1 and S-RTC implementations ported over, but neither of them currently work, and I'm kind of confused as to how the S-RTC is supposed to work. Does it keep track of how much time has occurred since the last delta, or does it behave like a normal RTC chip? I'd be surprised if the cart didn't just use a stock RTC from some third-party manufacturer, for which datasheets exist.
I'd be willing to look, if I can get a decent PCB scan for SHVC-AE6J-JPN.
