Apple II DOS Version 3.1 Source Code Released to the Public

The Computer History Museum has received permission to release the source code of Apple II DOS 3.1 to the public. The code was written by Paul Laughton, a contract programmer for Shepardson Microsystems, in just seven weeks.

On April 10, 1978 Bob Shepardson and Steve Jobs signed a $13,000 one-page contract for a file manager, a BASIC interface, and utilities. It specified that “Delivery will be May 15″, which was incredibly aggressive. But, amazingly, “Apple II DOS version 3.1″ was released in June 1978.

With thanks to Paul Laughton, in collaboration with Dr. Bruce Damer, founder and curator of the DigiBarn Computer Museum, and with the permission of Apple Inc., we are pleased to make available the 1978 source code of Apple II DOS for non-commercial use. This material is Copyright © 1978 Apple Inc., and may not be reproduced without permission from Apple.


There are seven files in the release which can be downloaded from the link below...

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