INT 2F - WinDOS v2.11 - GET ASSIGN VALUE                                        
	AX = AF14h
	BL = drive number (00h = A:)
Return: DL = drive number which is actually accessed by drive number BL
Desc:	determine the current mapping for a drive
SeeAlso: AX=AF00h"WinDOS",AX=AF13h"WinDOS",AX=0601h