Actually, the 81 is one of the calcs that TI doesn't have a manual for downloading, but if you get the 82 manual, the commands will be quite similar on the 81, except the 81 doesn't have as many as the 82. >Download the manual off ti.com. > Glenda wrote in message ><01bd6662$80b02ea0$6cc69dcf@glenda.anacapa.net>... > Can I do anything with it? I have instrument but no directions thanks >glendabird