Function   43h  Get/Set file attributes  (CHMOD) 
entry   AH      43h 
	AL      00h     get file attributes 
		01h     set file attributes 
		CX      file attributes to set 
		    bit 0       read only 
			1       hidden file 
			2       system file 
			3       volume label 
			4       subdirectory 
			5       written since backup 
	DS:DX   pointer to full ASCIIZ file name 
return  CF      set if error 
	AX      error code  (1, 2, 3, 5) 
	CX      file attributes on get 
		attributes: 
		01h     read only 
		02h     hidden 
		04h     system 
		0FFh    archive 
note 1) This call will not change the volume label or directory bits