Retrocomputing

Microsoft open-sources historic 6502 BASIC (8K VER 1.1), detailing its origins, licensing (including a $25,000 Commodore license in 1977), and lineage to GW-BASIC/QBASIC, with release hosted on GitHub and tied to ongoing open-source governance.

A data-rich retro-cryptanalysis showing how the Index of Coincidence can identify Enigma rotor settings on a Commodore 64, with explicit thresholds, timing, and scalability across modern hardware.