Re: How to debug inside the BIOS and/or interrupt?

"Rod Pemberton" <spamtrap@[EMAIL PROTECTED]
> wrote in message 
news:f6i2bg$9t8$1@[EMAIL PROTECTED]
>

Hi Rod, hi guys,

> Is the *entire* IRQ 2 routine wrapped in CLI/STI also?

On interrupt, the IF flag is cleared by hardware, and then
on the encounter of the IRET, the pop flags part restores
the IF flag.  No need for the CLI/STI pair.

If I were you, I would place an "in ISR flag" in my routine
then allow interrupts to happen.  Then at the first of the
routine, if "in ISR flag" is set, simply IRET.

Now that Interrupts are allowed, the IRQ 5 (or the Harddrive
interrupt) can now fire.  Is it that DOS is waiting for the
Hard drive interrupt to happen and since you have the IF
flag cleared, it is waiting indefinitely?

Ben