Category: <b>serial I/O</b>
<p>
<pre><b>INT 14 - PC-MOS/386 v5.01 $serial.sys v5.04 - CHECK OUTPUT QUEUE</b>

	AH = 20h
	DX = port number
Return: AX = number of bytes in output buffer
SeeAlso: AH=0Ah"Digiboard"
</pre>