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INT 15 - EXTENDED MEMORY - BLOCK MOVE (AT,XT286,PS)
        AH = 87h
        CX = number of words to move
        ES:SI -> global descriptor table (see below)
Return: CF set on error
        AH = status
            00h source copied into destination
            01h parity error
            02h interrupt error
            03h address line 20 gating failed
SeeAlso: AH=88h

Format of global descriptor table:
Offset  Size    Description
 00h 16 BYTEs   zeros
 10h    WORD    source segment length in bytes (2*CX-1 or greater)
 12h  3 BYTEs   24-bit linear source address, low byte first
 15h    BYTE    source segment access rights (93h)
 16h    WORD    zero
 18h    WORD    destination segment length in bytes (2*CX-1 or greater)
 1Ah  3 BYTEs   24-bit linear destination address, low byte first
 1Dh    BYTE    destination segment access rights (93h)
 1Eh 18 BYTEs   zeros