) Call HugeRealMode Server "Enable A20" function with: AL = 00h Return: AX = error code (see #03787) Note: The HugeRealMode Server requires an XMS-driver like HIMEM.SYS loaded before HUGEREAL (for XMS-memory allocation and A20 control). It utilizes some undocumented 386+ features to enable 4G code and data segments (flat memory model) in the CPUs real-mode. It is not compatible with V86-mode (as with most EMM386). For maximum speed and compatibility with DOS it uses a two stage interrupt model (see #03791) SeeAlso: #03789,#03790,#03791