There was a popular book series in Germany called 'xxx Intern' where xxx would be a computer model. For instance for the CPC: https://archive.org/details/cpc-4

There was a popular book series in Germany called 'xxx Intern' where xxx would be a computer model. For instance for the CPC: https://archive.org/details/cpc-464-intern-bruckmann-english-geritsacme https://archive.org/details/cpc-464-intern-bruckmann-english... (I have a physical copy of the followup book "CPC 664/6128 Intern", archive.org doesn't seem to have that one though)