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And now I delete all the tracks and start from the beginning.🤣

@yrabbit What is it your building. I see a processor, some isolation, a mini din plug. What is the end product?

@adamd Oh, this is a very simple PS2 keyboard converter to a dull switchboard. It imitates 7x10 key matrix with dozen special switches and polling which is the task of some ancient controller, similar to teletype😉
I quickly ran out of the processor outputs, but fortunately 74hc595 and optocouplers were close at hand (74hc595 has something about 7mA per pin so optocouplers).

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