My calculator works great also, but I also need a user manual. Thanks for any assistance you can give. browneggs@yahoo.com
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EC 4041 User's Manual
The Casio FX-300 is almost identical, and I found the user's manual for you. It has helped me greatly. Here is one URL http://www.casioeducation.com/resource/pdfs/fx300ms_training_guide.pdf
The URL below is a complete user manual. Hope it helps since Radio Shack won't. browneggs@yahoo.com