OSDev.org

Posted: **Thu Dec 20, 2007 4:32 pm**

Hello Gurus,
I'm assuming DOS is not not aware of APIC. How is a timer ISR working
in DOS which would have setup the 8259 PIC and hooked its handler to IRQ0?

Posted: **Thu Dec 20, 2007 4:34 pm**

sawdust wrote:Hello Gurus,
I'm assuming DOS is not not aware of APIC. How is a timer ISR working
in DOS which would have setup the 8259 PIC and hooked its handler to IRQ0?

I don't understand your question. Please elaborate. Also, have you checked the Wiki?

JAL

Posted: **Fri Dec 21, 2007 4:24 am**

IIRC DOS does not need any IRQs directly - the timer interrupt is still handled by the bios.

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APIC and DOS

APIC and DOS

Re: APIC and DOS