I did self-learned programming on an PET with the half-sized keyboard and cassette deck at highschool starting 1980. After 3 weeks or so I had filled the 7 KB of memory and needed to optimize GOTO commands by rearrangign the code. Every digit in the line number took 1 Byte, so many GOTO 20000 were wasteful. The trick to reveal the Microsoft text was known, but nobody knew what company that was. The PC did not exist yet.

My next step was Pascal on a VAX at Uni. Never looked back to PET or Microsoft. Linux user today.