was using push-connect breadboard, which I have just consigned to the bin.
That trash bin, I hope.

They "used to work " when currents were milliamperes which could "break through" the connection, but with CMOS they are worthless.

You are not the first here at 8052 with that experience and subswquent desision.

to all if you are using any kind of push the wire in protoboard read the post above and follow the example.

Erik