Category: <b>serial I/O</b>
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<pre><b>INT 14 - Digiboard DigiCHANNEL PC/X - SPECIAL CHARACTER FLAG/COUNTER</b>

	AH = 1Ah
	BX = subfunction
	    00h return pointer to special character flag byte
	    01h return pointer to special character counter word
	DX = port number (00h-03h) (04h-43h for XAPCM232.SYS)
Return: ES:BX -&gt; special character flag or counter
Notes:	flag is FFh if one or more special characters are in the receive
	  buffer; it is 00h and the counter is invalid if no special characters
	  are in the receive buffer
	counter (if valid) contains the number of characters in the receive
	  buffer up to and including the last-received special character
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