How to get ps2keyboard original scan code ?

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I use PS2Keyboard library from the playground.

A link to the exact version you're using is always best.

how to get the original keyboard scan code

The library doesn't support the reading of scan codes although it's internally using them. You can add this method to the library:

uint8_t PS2Keyboard::readScancode() {
  return get_scan_code();
}

This will return the next scan code or 0 if there was no keystroke left. To use it you have to add the appropriate code to the .h file too.