The UNIT is the system that allows anyone to back-up ROM cartridges to disk or cassette. No special knowledge of computers and/or programming is required. The software will auto-boot and is self-documenting and menu drive. All you have to do is follow the instructions on the screen. Once the files have been created the ROM cartridge is no longer needed. The UNIT program will also back itself up onto disk or cassette (not like many of other back-up programs).
Requires an Atari computer with 48K of RAM.
This appears to be extremely rare and the instructions mention that it is an update to an earlier 3.3 version. If you know more about this please let us know.
The manual is also available.