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From: Jason Mills <jmills AT cs DOT mun DOT ca>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Interrupt Handler Hanging?
Date: Thu, 21 Oct 2004 10:43:17 -0230
Organization: Memorial University of Newfoundland
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Jason Mills wrote:

> I will double check the hardware documentation to see if resetting is 
> necessary. However, the relevant IRQ status bit in the status register 
> does indicate other interrupts (after the first) are being trigger.
> 
> Should I somehow (?) acknowledge when the interrupt handler is done?? I 
> notice some people return 0 at the end of the handler.

After browsing the newsgroup a bit more, and with some
experimentation, I discovered I need to ack the handler using
outb(0x20, 0x20). It seems to work fine now. I will do more testing
to make sure.

> Is there something special I should do if I replace the existing IRS 
> with my own?
> 
> Jason
>