LisaPascal

> Not to mention they also demonstrated object-oriented programming Since 2023 we can study the source code of Lisa (see e.g. https://github.com/rochus-keller/lisapascal). Lisa’s system and applications were written mostly in Lisa Pascal (a compiled Pascal descendant) with some 68000 assembly; these compilers and their runtime bear no resemblance to the Smalltalk VM and bytecode system used on the Alto. The object‑oriented language Clascal was later created, as an "object‑oriented variant of Pascal", and used for the Lisa Toolkit; it later evolved into Object Pascal; both are statically compiled Algol‑family languages with Pascal syntax and a Simula‑style object model, not dynamically typed message‑sending systems like Smalltalk. Apple did not copy Smalltalk’s implementation or its language surface form for Lisa nor the Mac; there is bare

The new and relevant contribution is the "Apple Lisa Pascal Compiler sources", see the corresponding section and the link at the bottom of the page (http://pascal.hansotten.com/uploads/lisa/Lisa%20Pascal%20sou...). The "Apple Lisa Operating system sources" were already published in 2023 by the Computer History Museum (see also my code navigator, https://github.com/rochus-keller/lisapascal/).

Very interesting. Here are the two other videos in the series: https://www.youtube.com/watch?v=Qg0mHFcB510 Polaroids showing the Evolution of the Lisa GUI https://www.youtube.com/watch?v=NIJrCeRjZIU Bill Atkinson Interview for Lisa’s 40th Anniversary The videos were recorded in 2022, even before CHM published the source code. If you want to navigate the source code which Bill refers to in the video, here is a tool to do so: https://github.com/rochus-keller/LisaPascal.