You can see how it works in on this video since then, I have added code to print to an HP 82240 printer, which you can see in in this video. The calculator is complete and running!.Practical Numerical Methods, more advanced algorithms.Above all, I am behind in documenting it and publishing the source code. Note: The calculator has been completed, but I am still tinkering. With weak internet over a phone data line, I could only do some preliminary searches and mainly work out various details on a writing pad, and with a growing feeling that this kind of project may be personally exciting and practically doable. The idea for this project came about during a week of freezing arctic winter events here in Austin, Texas, with a failed power grid (as well as the Texas government) while keeping close to a gas fireplace, the only source of heat and light, for a few days.