🚀 go-pugleaf

I need to solve the following problem for which the 386/486 debug registers 
sound like just the ticket, but I have no documentation on their usage:

I have a system that has several custom boards which generate hardware 
interrupts on a 486.  One of the interrupt service routines is trashing 
several specific locations in memory, but I haven't been able to 
determine how.  I'd like to detect when one of the locations is trashed 
and invoke (another) interrupt service routine to help me trace the 
problem.  I can't use the 386 debug support of CodeView or other debuggers 
because they don't behave well when the debug trap occurs inside an 
interrupt.

My code runs in Dos--real mode, no windows, no memory managers (for now!).  
One of my specific concerns is that I might have to enter protected mode to 
use the debug registers--I'm not sure I want to learn all about the 
intracies of that!

Can anyone can point me to some good references (hopefully with examples)?  
Better yet, does anyone have any snippets of code that set up the debug 
registers and provide the shell of an isr for the interrupt generated?  
Please respond by e-mail.  I'll post a collection of the responses.	

--
Galen Kannarr
kannarr@mk1501.dseg.ti.com
Texas Instruments Incorporated