"Thomas C. Sefranek" wrote: > > I have a simple device built with a 16C73A. > I read two channels of the A-D, a dual color LED to indicate which channel, > do a table lookup, and write a byte to Ports B and C. Maybe for some reason your code falls off the end of the lookup table above these voltages. -- Best regards Tony http://www.picnpoke.com Email sales@picnpoke.com