Serial number

• defect

I bought this calculator at Ebay. When I put in batteries for the first time, it did not work. I kept it nevertheless and tried to repair it. It perfectly worked for two days and died again. I suspected contact problems and finaly decided to connect keyboard and CPU by soldering wires between them. The result was a still not working calculator with ugly wires and soldering in it. Can't say that I am proud of this action...