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Notes:
1: Some vipers have a large pc104 interrupt load. Occurs with both Sep 14 (a1,a8) and the Oct 4 (a5) kernels.
2: Not completely sure why on m21 the IRQ3 load is less than the pc104 load. Perhaps that version of the pc104 irq routine exits if pending bits are 0.
3: High USB interrupts are seen on vipers with bluetooth radios interfaced via USB. Not on Titans. Assume it is due the different interfaces. On , even though on a1-19 Viperstitans, only the bluetooth radios and flash drives are on USB. On Titans a1-19 Vipers, only bluetooth and flash drive radios are on USB. Assume it is due the different interfaces.
4: On c20,m21, m22, USB is used only for flash drives
The only titans with PC104 serial are a3 and m22. They're both OK.
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