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From:	Charles Sandmann <sandmann AT clio DOT rice DOT edu>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: missing hardware interrupt intermittently
Date:	Mon, 24 Oct 2005 22:12:45 CDT
Organization:	Rice University, Houston, TX
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> Our system is missing HW interrupt 6 very intermittently ... 
> I suspect that the interrupt is
> missed when cswdpmi.exe is in the process of loading or unloading.  
> ...Any ideas on missed interrupts while cwsdpmi.exe is loading or unloading?

CWSDPMI reprograms the PIC on entry and exit, so anything that happens in
that time could be lost.  The startup has some extended sections with 
interrupts disabled when setting up protected mode (A20 stuff, etc), but
I would expect that to result in a late interrupt, not one missed.

You could try PMODETSR as an alterate replacement to see if if it's 
compatible and avoids the problem; it has a different way of handling
interrupts.

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