)
Values for EMS function status:
 00h	successful
 80h	internal error
 81h	hardware malfunction
 84h	undefined function requested
 8Fh	undefined subfunction
 9Ah	specified alternate map register or DMA register set not supported
 9Bh	all alternate map register or DMA register sets currently allocated
 9Ch	alternate map register or DMA register sets not supported
 9Dh	undefined or unallocated alternate map register/DMA register set
 9Eh	dedicated DMA channels not supported
 9Fh	specified dedicated DMA channel not supported
 A3h	source array corrupted
 A4h	operating system denied access