With permission from Apple, The Computer History Museum and the Digibarn Computer Museum announced today it is publishing the original DOS source code for Apple’s 1978 Apple II. The Apple II was the first fully assembled computer with a monitor that Apple sold following the Apple I and originally retailed for $1298 for the base model with just 4K of memory.
A blog post from The History Computer Museum explains that Apple contracted Paul Laughton of Shepardson Microsystems to write the Disk Operating System for the Apple II in just seven weeks. In April of 78, Steve Jobs and Shepardson signed a contract (pictured below) that would see Apple pay $13,000 for a file manager, a BASIC interface, and utilities. The source code being released today is scans of original documents that Laughton kept over the last 30+ years: