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This is on the topic of extending the Cn2 interrupt with some of my own code, under certain circumstances, making it do one additional task before exiting the interrupt code.

I know that certain OS bcalls can turn off interrupts. Is ChkFindSym one of them? Can I safely call it within the interrupt routine? If so, how much of a slowdown will it cause if it executes only once each time the interrupt occurs?
  
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