Category: <b>other operating systems</b>
<br>Flags: Undocumented function<p>
<pre><b>INT 21 - DR DOS 5.0+ - HISTORY BUFFER CONTROL</b>

	AX = 4456h
	DL = control flags (see <a href=../../it/82/15.html>#01582</a>)
Return: AL = previous value of state flags (see <a href=../../it/83/15.html>#01583</a>)
Note:	DR DOS 6.0 only checks bit 0 and ignores the rest of DL
SeeAlso: <a href=../../it/84/15.html>#01584</a>

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