My first computer, apart from a Sinclair programmable calculator, was a Sinclair ZX80. I was fascinated and started learning how to program. I remember reading about the CHR$ instruction and figured out how to get it to write on the screen Hello World one character at a time. I thought I was very clever until I turned over the page of the manual and learnt about strings and found I could do it in one command. Computers were brilliant because they would do exactly what they were told—unlike the kids I was teaching chemistry at the time.
My next computer was a BBC Model B (Much better manual and you could save on 5¼" discs!) I switched to teaching computers and found myself also teaching the staff how to use them. I learned how to network the computers using a 380Z fileserver. I bought a 10MB hard drive thinking "I'll NEVER fill that!"
From the BBC B I went to Acorn Archimedes RISCOS computers - my favourite machines of all time. I still miss their 3 button mouse concept where right clicking had the opposite effect to left clicking.
Sadly Acorn died leaving only it's subsidiary ARM. I moved to PCs.