A detector of 40 pins connector, for 89C2051,89C2041,8951,8952, pic, arduino, etc...

The below was what I designed for a detector of input port of 40 pins connector, it can be expands to more pins to detect that when you need more I/O ports.

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The below was what I designed for a detector of output port of 40 pins connector, it can be expend to more pins to detect that it just need more I/O port.

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