You can find John on Twitter at [twitter.com/jgrahamc](https://twitter.com/jgrahamc).
- Babbage overview and the Difference Engine:
https://www.computerhistory.org/babbage/overview/
- Difference Engine No. 2 at the London Science Museum:
https://collection.sciencemuseumgroup.org.uk/objects/co526657/difference-engine-no-2-designed-by-charles-babbage-built-by-science-museum-difference-engine
- BBC Micro: https://en.wikipedia.org/wiki/BBC_Micro
- Sinclair ZX81: https://en.wikipedia.org/wiki/ZX81
- BBC Micro Advanced User Guide:
http://stardot.org.uk/mirrors/www.bbcdocs.com/filebase/essentials/BBC%20Microcomputer%20Advanced%20User%20Guide.pdf
- Sharp MZ-80K: https://en.wikipedia.org/wiki/Sharp_MZ
- John's TED Talk, The greatest machine that never was: https://www.ted.com/talks/john_graham_cumming_the_greatest_machine_that_never_was
- Hilbert's Problems: https://mathworld.wolfram.com/HilbertsProblems.html
- Gödel's incompleteness theorems: https://plato.stanford.edu/entries/goedel-incompleteness/
- The Lovelace–De Morgan mathematical correspondence - A critical re-appraisal: https://www.sciencedirect.com/science/article/pii/S0315086017300319
- The mathematical correspondence of Ada Lovelace and Augustus De Morgan:
https://dl.acm.org/doi/10.1145/2867731.2867738
- Douglas Engelbart: https://www.britannica.com/biography/Douglas-Engelbart
- "Mother of all demos": https://www.youtube.com/watch?v=yJDv-zdhzMY
- John's OSCON talk "Turing's Curse": https://www.youtube.com/watch?v=hVZxkFAIziA
- Design of the RISC-V Instruction Set Architecture:
https://people.eecs.berkeley.edu/~krste/papers/EECS-2016-1.pdf
- Engines of Creation - The Coming Era of Nanotechnology: https://www.amazon.com/Engines-Creation-Nanotechnology-Scientific-Revolution/dp/1872180469/ref=tmm_hrd_swatch_0?_encoding=UTF8&qid=&sr=
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