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PostPosted: Wed Apr 18, 2018 1:53 pm 
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Joined: Sun Sep 19, 2004 11:12 pm
Posts: 20878
Location: NE Indiana, USA (NTSC)
Two possibilities:

A. It disables NMI before calling the test routine and reenables NMI afterward.
B. The NMI handler doesn't write to any RAM locations that the test routine uses. In a lot of my programs, for example, NMI just increments one location in zero page.


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