Category: <b>disk I/O enhancements</b>
<br>Flags: Undocumented function<p>
<pre><b>INT 13 - HARD DISK - PS/1 and newer PS/2 - SET CONTROLLER FEATURES REGISTER</b>

	AH = 23h
	AL = feature number (see <a href=../../it/66/2.html>#00266</a>)
	DL = drive number (80h,81h)
	???
Return: CF clear if successful
	CF set on error
	AH = status (see <a href=../../it/34/2.html>#00234</a> at AH=01h)
SeeAlso: AH=21h"PS/1",AH=22h"PS/1",AH=24h"PS/1",AH=25h"PS/1"

</pre>