Guido van Rossum has published the original ABC programming language source code from 1991 on GitHub. ABC was Python's direct predecessor, developed at CWI between 1983-1986. The repository contains the historic abc-unix tarball sources, which currently require a 32-bit system to build. The code is under CWI copyright without a formal open-source license yet, though negotiations for an MIT license are planned. This release provides developers access to an important piece of programming language history that directly influenced Python's design.
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