Category: other operating systems
Flags: Undocumented function

INT 21 - DR DOS 5.0+ - HISTORY BUFFER CONTROL

	AX = 4456h
	DL = control flags (see #01582)
Return: AL = previous value of state flags (see #01583)
Note:	DR DOS 6.0 only checks bit 0 and ignores the rest of DL
SeeAlso: #01584