Quite old. I was in my mid 20s. But this was in the early 1970s. It was a BASIC program. I was given about 20 80-column cards which I had mark with a thick bla

Quite old. I was in my mid 20s. But this was in the early 1970s. It was a BASIC program. I was given about 20 80-column cards which I had mark with a thick black pen in the relevant positions. I then gave the pack back to the friend who had access to one of the early multi-user terminals in another town and who could run it. He was impressed that it ran perfectly without any syntax errors, but not that it was an infinite loop. <grin> On the other hand, my first computer I had to build with a soldering-iron and a very large box of parts in 1979 and that's what finally enabled me to begin programming for real, in both BASIC and Assembly Language.