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OUT sends a byte to a hardware I/O port.
 
OUT port, data%
 
Usage Notes
    ■ The OUT statement complements the INP function, which returns the
      byte read from a hardware I/O port.
    ■ OUT and INP give a BASIC program direct control over the system
      hardware through the I/O ports. OUT and INP must be used carefully
      because they directly manipulate the system hardware.