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