Alas, it seems the rackmount Acorn A4000 I built is dead, at least for now. During the LAN party, the Arduino (which runs the soft power off) came loose and touched the +12V test point on the power supply. Turns out it put 12V straight up the I2C Bus SDA pin and has blown that I/O pin on the SoC. Feck.
It still "boots" but the I/O pin appears to the CPU as being permanently low, i.e. I2C Ack and all data bits low.
The good news is, while the RISC PC was dead, it only needed the power supply recapping to come back to life. And now the "my RISC PC PSU is dead, what do?" thread on Stardot has a capacitor list and repair caveats for the Hitron Issue 4 103W power supply. Which I've been successfully putting off doing for about two years...
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