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Not being able to test 82c55a

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gkmaia:
Arduino delay ranges up to 1 millisecond. This IC is rated at nanoseconds.

1 millisecond  =  1.000.000 nanoseconds.

Delay wont make a difference here... it is something else.

Have also tried D0 and PA0 as open collectors with 1k res to VCC. No luck.

Thanks for the link. Has some good stuff there.

greenpossum:
Arduino library has delayMicroseconds(). The interval between two successive pin changes can be quite short, as you, the programmer, did not constrain it. Put a scope on it if to be sure. Too short a pulse width hurts, longer doesn't as most of the intervals in the data sheet are minimums.

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