rem: char* attr(int8 attrib)
add: attr(int8 attrib)
context: char* attr(int8 attrib){	switch (attrib) {		case 0x00: return "Control";		case 0x01: return "Isochronous";		case 0x02: return "Bulk";		case 0x03: return "Interrupt";	}	return "?";}