INT 21 U - DOS 5+ ROM - GET EXCLUSION REGION LIST
        AX = 6F02h
        ES:BX -> buffer for exclusion region list (see below)
Return: ES:BX = 0000h:0000h on error, unchanged if buffer filled
SeeAlso: AX=6F00h,AX=6F03h

Format of exclusion region list:
Offset  Size    Description
 00h    WORD    number of entries
 02h 2N WORDs   start/end segments of N excluded regions

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