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INT 31 - DOS Prot-Mode Interface 0.9 API - protected mode - ALLOCATE LDT DESCRS
        AX = 0000h
        CX = number of descriptors to allocate
Return: CF set on error
        CF clear if successful
            AX = base selector
Notes:  the base and limit of the returned descriptors will be 0
        add the value returned by INT 31/AX=0003h to move to subsequent
          descriptors if multiple descriptors were allocated
SeeAlso: AX=0001h,AX=000Dh