Posted by Jeroen Pluimers on 2013/08/12
While researching some other historic information about Delphi, I bumped into this thread: New DPMI host – delphi.
If is a small thread describing what kinds and versions of DPMI hosts were available to run Turbo Pascal based programs.
DPMI stands DOS Protected Mode Interface: a way for real mode DOS programs to access protected mode features (mainly memory above the 1 megabyte barrier).
I had plainly forgotten that the DPMI host shipped with Delphi 1, and wasn’t aware you could have a 32-bit DPMI host at all.
Some other memory related abbreviations from that era: Read the rest of this entry »
Posted in Borland Pascal, Delphi, Delphi 1, Development, Object Pascal, Pascal, Software Development, Turbo Pascal | 2 Comments »
Posted by Jeroen Pluimers 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.
PS: A nice introduction to Object Pascal for a Macintosh is at MacTech | The journal of Apple technology..
Posted in Delphi, Development, Object Pascal, Pascal, Software Development, Think Pascal | Tagged: apple technology, computer, computer history museum, desktop interface, human interface guidelines, mac programmer, macintosh developers, object pascal, software, technology | Leave a Comment »