As a guide to DOS 3.3 for the Apple II, All About DOS contains many useful programs and in-depth topics. This new Enhanced Edition, encompassing over 560 pages, is improved with a new design, art, glossary, and technical appendices. It includes a wide variety of references and how-to's, making it a great reference for Apple II programmers. Highlights Include:

- "How DOS Works" - RWTS, Internals, Diskettes.
- "The Directory" - Sectors, Catalog Edit, Wildcards.
- "File Handling" - Sequential to Random files, EXEC
- "Speeding Up DOS" - Fast Boot, Loaders for Text, BASIC, Binary.
- "Repairing Bugs" - Sequential files, Sector display, Stack.
- "DOS Modifications" - Customizing, Using available holes in DOS.
- "'R' Files: Relocatable Object Code" - Create code with the Toolkit assembler.
- "Utilities" - Automate DOS patches, Disk Error Checking
- "Memory Management" - Moving DOS to the Language Card.
- "Other Operating Systems" - DOS 4.1, Pascal, CP/M, TRS-80, Atari.