We had a different but related thread a few weeks ago: What age, machine, and language did you start programming?
Not the same thing, but there’s a lot of overlap ;-)
I mention this because I would write the exact same thing here ^-^, here’s an edited version of my reply:
My first contact with a computer: ZX 80... but I remember the machine, not even what we ran with it!
Then in the early teens Amstrad CPC 464 (later with an external floppy drive), and Basic (but hardly really getting into programming, the fun was to copy pages and pages of listing to copy the code of small games). My big brother and I spend so many hours with this thing in our teens!
A few years later (teenager), a x86 something (no hard drive, only black and green screen), many different DR-DOS setups to start the thing. An RPG (forgot the name and Deluxe Paint II consumed so many hour son this machine ;)