INT 15 - SYSTEM - COPY EXTENDED MEMORY

	AH = 87h
	CX = number of words to copy (max 8000h)
	ES:SI -> global descriptor table (see #00499)
Return: CF set on error
	CF clear if successful
	AH = status (see #00498)
Notes:	copy is done in protected mode with interrupts disabled by the default
	  BIOS handler; many 386 memory managers perform the copy with
	  interrupts enabled
	on the PS/2 30-286 & "Tortuga" this function does not use the port 92h
	  for A20 control, but instead uses the keyboard controller (8042).
	  Reportedly this may cause the system to crash when access to the
	  8042 is disabled in password server mode (see also PORT 0064h,#P0398)
	this function is incompatible with the OS/2 compatibility box
SeeAlso: AH=88h,AH=89h,INT 1F/AH=90h