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Adobe Photoshop 1.0 Source Code About 75% is in Pascal, get it from the Computer History Museum

Posted by jpluimers on 2013/02/15

Thanks Lennart Aasenden for sharing this on FaceBook: Mariuz’s Blog: Adobe Photoshop 1.0 Source Code About 75% is in Pascal.

This was back when I was already a professional Turbo Pascal for PC programmer, not yet a Mac programmer, but doing Pascal on VMS to assist a client in the scaleable font industry.

The 1990 version 1.0.1 of Photoshop code was written in Object Pascal, and based on MacApp.

Back then Apple’s Object Pascal was one of the few IDEs available to develop Macintosh software. Later on, you also had Turbo Pascal and THINK Pascal (which many Macintosh developers preferred, was later acquired by Symantec, and died). A big reason they liked it so much was the THINK integrated debugger, which was lightyears ahead of any Pascal product on any other platform.

Apple had great documentation, not only on their compilers and libraries, but also one that everyone should hav read: Apple Human Interface Guidelines: The Apple Desktop Interface: Inc. Apple Computer: 9780201177534: Amazon.com: Books.

The Adobe Photoshop 1.0 source code can be downloaded (for non-commercial use) from the Computer History Museum | @CHM : Adobe Photoshop Source Code page.

The source is a very interesting read, and a great comments on it by Grady Booch.

This is how everyone should think about their code.

–jeroen

PS: A nice introduction to Object Pascal for a Macintosh is at MacTech | The journal of Apple technology..

4 Responses to “Adobe Photoshop 1.0 Source Code About 75% is in Pascal, get it from the Computer History Museum”

  1. Reblogged this on Marius reshares.

  2. Popa Adrian Marius said

    Also Lisa OS is written in Pascal (soon to be released) https://arstechnica.com/gadgets/2017/12/source-code-for-apples-historic-lisa-os-to-be-made-available-in-2018/

    • jpluimers said

      Thanks for the reminder. A while ago, I had already scheduled a blog post about it for me to check that source code out. It’s way back in the queue at a moment I should have indeed time to check it out.

  3. […] Adobe Photoshop 1.0 Source Code About 75% is in Pascal, get it from the Computer History Museum « T…. […]

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