That Usborne book series was amazing - it seems amazing nowdays that there were books explaining machine code targeted at children, young me was so glad that th

That Usborne book series was amazing - it seems amazing nowdays that there were books explaining machine code targeted at children, young me was so glad that they existed. I can remember writing machine code for my spectrum with it (and the spectrum owners' manual also had an appendix with what I remember was just a plain 0-255 list of bytes => instruction mnemonics!)