I started with an Atari 600XL, added the cassette tape drive. (!) Looking back, that was a nightmare device. I still have it, and it still works. I upgraded to an 800XL and added the 1050 floppy disk drive. Still have all of my Atari home computer hardware, and I've kept it up well, and it all still works. I even made the modifications to the 800XL to make it a quarter-meg of ram (for those who remember that) My first experience with assembly language was with these computers, and I even wrote a 'new' high level language and compiler for it. I call it ESE (taken from computer-ese). Started with a compiler in Atari Basic and then after getting the system to work, compiled ESE using itself! How's that for CASE?