Stumped

[Orin Eman]

> >>What does it look like the irq is doing?  I cannot think of too
> >>many things that a car computer would be doing with an IRQ,
> >>knock input maybe, car on, off, maybe, and probably watchdog.

Everything in my ECU runs off interrupts.  The main loop just sits
checksumming the ROM.

Mostly, it's off the timer interrupt, but dwell is done off a
counter interrupt.  The cylinder 1 timing signal drives an IRQ.
The knock sensing uses a window driven off another counter interrupt.

Orin.