Haha. I'm so old that the first computer I was introduced to in my first job (it may have been a Data General mainframe; my memory is fuzzy) had a solid copper

Haha. I'm so old that the first computer I was introduced to in my first job (it may have been a Data General mainframe; my memory is fuzzy) had a solid copper "ribbon" running along the bottom inside the cabinet, and I was told "Don't drop a screwdriver on that or you'll short out the whole floor". The inside of the cabinet door had what looked like black "flash marks" on it. I also had to recover a program from a paper tape drive in that first year.