I've been spending some time tracing the RISC PC CMOS circuit with the aim to repairing motherboards with battery damage. The image below shows a MKIII board and how I believe the circuit is laid out. The MKII is similar. I have managed to repair 2 boards so far based on this.
Hopefully it's of use to others and it should be similar to the A7000 and older machines.
Arc/RPCs, peripherals, RISCOS operating system & ARM kit eg GP2x, BeagleBoard
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