The Atari 800 was my first personal computer (i.e. one I had at home). I bought one when they first came out and learned 6502 assembler language and had a blast.

I had experience with assembler language on larger computers (DECSystem 20 and CDC 6400 in high school/, IBM System 360/44 in college then IBM System 370/145 at work) but having my own personal computer was incredible. Of course I moved on to the IBM PC when it first came out (and learned 8086 assembler language), and many PC compatible computers after that, until I retired and got my first iMAC (Intel x32 and x64), then now to my M1 Macbook Pro.