I've got an 600XL and two 800 XL's and a couple Atari 800's.
I'd like to use them to learn assembly language. I have the Atari assembly cartridge but I read that it's buggy so I am keeping my eyes out for an different assembler.
I'd like to learn how to connect them to a PC so I can use hard drive storage. I'd also like to find a way to send the video to a PC monitor if possible. I just don't have room in my office for another television, two floppy drives and all the adapters.