When I was a kid, about 12 years old, I used to play and write basic programs on ATARI XL 800. I loved it and enjoyed it so much. I saved the whole of it in my warehouse. So around 2006, I found a whole world of atari 8 bits computers with games and emulators. I took my old ATARI 1050 driver, and I could copy the data from the atari diskettes I kept from the '80s, and it was nice to remember old stuff like atari dos2,dos3, player missiles, and more.

The atari emulator uses ATR disk format, and I wrote this small project to handle those files. It supports atari xl800 dos2 and dos3 file systems. The basic concepts of today's CPUs are similar to the old ones, like the atari 6005 CPUs,' and that old filesystem has basics familiar with today's modern file systems. So it was an excellent study to work on such a simple file system.