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Q.The demo program of "DIO144Int" does NOT work with the
  DIO-96 hardware ?
A.Yes. The DIO-96 hardware NOT support the interrupt feature.

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Q.The demo program of "DIO64Int" does NOT work?
A.This demo program have to setting the JP3 jumper to "Timer 
  Interrupt", and uses the Counter-4 and Counter-5 to be the
  trigger source. Thus, the demo program only works with the
  DIO-64/6 (with second 8254 Timer/Counter chip installed.) 

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Q.I connect the CN1 with CN2 and CN3 with CN4 to test the DI/O,
  but it sometimes NOT works.
A.You can NOT do that. Because of .... 
  CN1.Pin20 ==> +12v,         CN2.Pin20 ==> STROBE
  CN3.Pin20 ==> +12v,         CN4.Pin20 ==> STROBE
  Thus, you can NOT connect CN1 with CN2 and CN3 with CN4 directly.

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Q.Does the Counter for every mode of 8254 needs TWO External-Clock 
  to initializes it?

A.Yes, it needs two ECLK to initializes it. Otherwise, the Counter
  will not works and always reads the wrong counter values.
  And therefore, the actually counter value ,that read from the 
  8254, must add 2. For example: Actual_value = Counter_value + 2.

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Q.In the DIO-64/6 DI/O card, the Counter4 had been cascaded to the
  Counter5. The Counter4 works well, but the counter5 does not works.

A.The Counter5 needs TWO starting ECLK to initialize the 8254. And 
  the Counter4,in the Mode-0, will generates ONE pulse only. Thus,
  this causes the Counter5 always not works.

  Setting the Counter4 to Mode-2 will makes it to generates clock 
  pulse and the Counter5 will works well.