CodeView (cv.hlp) (Table of Contents; Topic list)
Port Output (Description)
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     The Port Output (O) command sends specific byte values to hardware
     ports. You can use this command in Assembly mode to write code
     that interacts directly with hardware.
 
     The Port Output command is often used in conjunction with the
     Port Input (I) command.
 
     See: Port Input (I) Command-Window Command
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