If I do "pidin irqs" the handlers that I see connected to procnto-smp-instr show following:

irq 0: seems to be a no-op
irq 1: seems like a handler.

Are QNX IRQs not directly mapped to x86 IRQs?

My board has Pentium M and 6300ESB chipset. Does QNX use APIC or PIC to generate timer interrupt?

I have captured a rare hang in JTAG connected system. It seems like no interrupts are coming in. Every time I stop in 
JTAG, the processor seems to stop at a HLT instruction in kernel with interrupts enabled around F0050216. 

If this is not the right forum, then please let me know where I can get better help.

Thanks.