INT E6 - Linux DOSEMU - CHANGE CURRENT UNIX DIRECTORY                           
	AH = 81h
	ES:DX -> ASCIZA NUL-terminated ASCII string.	The ASCIZ string "ABC" consists of the four bytes 41h, 42h, 43h, and 00h.  Unless otherwise specified, maximum lengths given in the interrupt list do not include the terminating NUL. directory name
Return: nothing
SeeAlso: AH=00h,AH=80h