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Original Photoshop Source Code Released
15 February 2013
The Computer History Museum has made available the source code for Photoshop 1.0.1, a collection of 179 files mostly written in Pascal with a little Motorola 6800 machine language tossed in.
Screenshot from the User Guide
The Museum blog explained:
With the permission of Adobe Systems Inc., the Computer History Museum is pleased to make available, for non-commercial use, the source code to the 1990 version 1.0.1 of Photoshop. All the code is here with the exception of the MacApp applications library that was licensed from Apple. There are 179 files in the zipped folder, comprising about 128,000 lines of mostly uncommented but well-structured code. By line count, about 75% of the code is in Pascal, about 15% is in 68000 assembler language, and the rest is data of various sorts. To download the code you must agree to the terms of the license.
Also available are the 1990 User Guide and a tutorial.