I am trying to make a manual how to redesign the electronic calculator to become sustainable in a hunting and gathering lifestyle. Which means that all things must be made in the wilderness from scratch and be transportable since hunter and gathers were nomadic. This may include smelting ore, building tools, soldering, make copper wire, creating magnets, building generators, building semiconductors etc. Of coarse some of these things might not be needed in the new design but the only way to find out is for those who are willing to collaborate to make it happen. The possibility of designing a working model will not be known unless someone else has weighed out all the possibilities involved in remaking an electronic calculator in this environment, so please don't turn this into a discussion about whether or not it is possible. Although I am sure there were always be an unqualified response like "its impossible". Questions and comments about the feasibility of the project will just slow down the process of the project. The other question is why should this be done and my answer is because always pursuing a path based on immediate necessity can only provide us with limited knowledge. If we question long term solutions for larger problems there will be new knowledge in it. It is exactly the improbable places and situations that provide real new knowledge. Do not assume! That hunter gather refers to a time frame it is a way of life. The functionality comes as a secondary to the purpose of creating the manual with an alluring narrative. But somehow we cannot have one without the other. p.s. an abacus is not electrical, a slide rule is not electrical and a mechanical computer is not either, if you are going to suggest a vacum tube then how to we get it small enough to transport?