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Jane Street's challenges are known for their ability to nerd-snipe developers, and their ASIC reverse engineering puzzle was no exception. This post dives into a developer's journey through a month-long rabbit hole,
This article explores the reverse engineering of IBM's MCGA gate arrays, the 72X8300 Memory Controller and 72X8205 Video Formatter. It details newly discovered, previously undocumented features like genlock capabilities, various clock controls, and manufacturing test registers. These insights offer significant value for hardware enthusiasts, preservationists, and emulator developers seeking a deeper understanding of vintage IBM PC graphics hardware.
