Beneath Apple DOS (Don Worth & Pieter Lechner (1981) Quality Software ISBN 0-912985-00-3)

I just had to share this. I was so happy few years ago to receive the classic Apple ][ – manual “Beneath Apple DOS” from Don Worth himself with an signature. The book is essential for understanding Apple DOS (there’s also an book about ProDOS).

Don loves Finnish Metal music, as you can see 🙂



OCR’d PDF available at:

Article about Don Worth:

And Don Worth’s own personal webpage: