I have a nice resistor program, but I need to find it. I'll send it to you as soon as I find it! It uses the graphing screen and is very nice to use. doesn't take too much memory either! -- Richard Piotter richfile@prairie.lakes.com The Richfiles TI Hardware and BASIC web page: http://www.geocities.com/SiliconValley/Lakes/5081/Richfiles.html