Category: <b>serial I/O</b>
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<pre><b>INT 14 - Digiboard DigiCHANNEL PC/X* - INPUT QUEUE CHECK</b>

	AH = 0Ah
	DX = port number (00h-03h) (04h-43h for XAPCM232.SYS)
Return: AX = number of characters available in buffer
Note:	this function is also supported by the PC-MOS/386 v5.01 $serial.sys
SeeAlso: AH=09h"Digiboard",AH=0Dh"Digiboard"
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