I began using computers when I bought my first ZX81 kit and built it.
It had a whopping 1K of RAM and programs could be saved and loaded to audio cassette tapes which was a real hit and miss affair.
Progression from there was the ZX spectrum, BBC micro, Commodore 64, Atari ST 400 (I think), Apple Macintosh....... modern day PCs.
Still, fun days.