Directory tree? I had a cassette player. This is a computer that you upgrade the OS by going to a computer show and buying a new ROM. Dad watched just to make sure I didn't electrocute myself. He drove me 50 miles buy a debugger on another ROM chip for my 14th birthday. My parents thought these new fangled computers might be important someday, and bought me one to "play" with. I didn't have Google, but I had the instruction manual for the 6502. Life was good.