Category: <b>DOS kernel</b>
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<pre><b>INT 21 - DOS 1+ - WRITE CHARACTER TO STDAUX</b>

	AH = 04h
	DL = character to write
Notes:	keyboard checked for ^C/^Break, and INT 23 executed if detected
	STDAUX is usually the first serial port
	if STDAUX is busy, this function will wait until it becomes free
SeeAlso: AH=03h,INT 14/AH=01h,INT E0/CL=04h
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