Hi Bill,

Are you using version 1.00 of DT_INTS-14.
http://www.darreltaylor.com/DT_INTS-14/intro2.html (bottom of page)

If so, try adding this define ...
DEFINE INT_ENABLECLEARFIRST 0

By default, the INT_ENABLE command clears the flag first before enabling.
So, if there is an interrupt pending, it will be discarded.

Adding the define tells it to NOT clear the flag first.
It's only available in the 1.00 version.

hth,