Mr. Atari has written a new DOS for Atari users, it’s small, only 2K so you have more free memory, boots in only a couple of seconds, compatible with DOS2, 2.5, MyDOS, supports wildcards, has a ESP8266/Rverter R:Driver: for WiFi connection to BBSes etc., an 850 compatible R: driver, a formatter for LitDOS disks and all the most used DOS commands.

Not bad for 2K!

LiteDOS is still in active development, version 2.01 was just released, so go check it out on Mr Ataris website