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Originally Posted by Eldarion
OK, I might have figured this out:
Has anyone noticed if the red "Code Error" LED on the OI is steadily on during the 8.3-volt bug?
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For us, the Code Error light WAS NOT on. The Radio light showed an error, and the Team LEDs quit blinking, but the Code Error light was the first thing we and Corey from IFI (who did a good job peering at dead bots on the field trying to debug them) checked.
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I was doing some experimenting with the 2005 RC upgraded to v12 of the master firmware. Taking the advice of another person in this thread, I tried downloading frc_gyro.hex to the controller, at which point I was greeted with the 8.3V display and a solid red Code Error light. The interesting thing about this was that the Program State LED on the RC was steadily orange and the RC was ready to accept programming? 
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Odd. I haven't been able to replicate this on a 2005 RC, but I'll try upgrading to v12 firmware.
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My thought is that maybe the 8.3V display is one manifestation of the sequence that is supposed to trigger a BLROD, halt the user processor, and kill all the PWMs, and it is simply displaying the 8.3V without doing the rest?
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I'll note that you can see the 8.3V problem with code that otherwise appears to work correctly.
When I last talked with IFI, their guy was fairly convinced it was something in the ADC interrupt handler (which has a lot of code for an interrupt handler)