Simon Willison 3/21/2026

Turbo Pascal 3.02A, deconstructed

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The article details a project to deconstruct the 39,731-byte Turbo Pascal 3.02A executable from 1985. Inspired by its compact size, the author used Claude AI to analyze the binary, decompile it to assembly, and create an interactive artifact that segments and annotates the code to explain the inner workings of this historic compiler and IDE.

Turbo Pascal 3.02A, deconstructed

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