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I'm wondering, since I can send data to a output pin from an input pin (the opposite way it should be) without any problem, it shouldn't be very hard to add bidirectional pins, is it?
It would be nice for data bus and other half-duplex communications.

In short it's just a visual thing, not really a entire new feature.

Sounds like good idea. I will see how to implement it.

I also need this to design the 74245 http://pdf1.alldatasheet.com/datasheet- ... asheet.pdf