My grandfather was a construction engineer. I remember visiting his office around 1990 just before he retired. His only computer was a Commodore 64 and he had

My grandfather was a construction engineer. I remember visiting his office around 1990 just before he retired. His only computer was a Commodore 64 and he had written all the software himself in BASIC over the years, just translating a lifetime of professional experience into these little interactive programs on floppies. Maybe the modern equivalent would be to use Excel.