INT 21,47 - Get Current Directory

	AH = 47h
	DL = drive number (0 = default, 1 = A:)
	DS:SI = pointer to a 64 byte user buffer


	on return:
	DS:SI = pointer ASCIIZ directory path string
	AX = error code if CF set  (see DOS ERROR CODES)


	- returns the current directory relative to the root directory
	- the leading slash "\" and drive designator are omitted