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Message: <blockquote data-quote="T-Square" data-source="post: 20030" data-attributes="member: 12905">[code]eingang = IO.m_Port.Tasten(0x378+1);[/code]just reads the input pins from the printer port (Pin10,11,12,13 and 15).PIN11 is Bit4 at address 0x378+1 (printer statusport), PIN10 is Bit3, PIN12 is Bit2, PIN13 is Bit1 and PIN15 is Bit0.If a button is pressed the Bit changes from 1 to 0 (Bit4 changes from 0 to 1 because PIN11 is hardware inverted).No button pressed is 15 decimal (01111 binary).With these 5 inputs a very simple button matrix with up to 31 buttons can be connected.But to answer your question:This just checks the current state of the port. A button event is any change of this input (one change for button down and one for button up).</blockquote>