[cctalk] Re: the 1968 how to build a working digital computer

Instead of paper clips and cardboard, consider a pachinko like marble based computer. (claimed to be Turing complete, if you expand it enough) https://upperstory.com/en/turingtumble It's bulkier than a mobile phone. or relays? : https://www.amazon.com/Giant-brains-Machines-that-think/dp/B0006AS6Q4 Giant Brains : or Machines That Think by Edmund C. Berkeley His Simon computer was a relay based (a bit limited for modern uses), but was an early (1950) electro-mechanical personal computer.