xBIOS is like a programmers version of DOS. With it you can easily access files from your programs without using Atari DOS. It is smaller than DOS and therefore saves memory in your programs. You can even run programs from as low as $0200, however $0800 or $2000 are more common.
Limitations
- New files cannot be created.
- Existing files cannot be extended in length.
- New directories cannot be created programatically.