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I knew that Hercules existed but I had never seen one or found any documentation for its graphics mode. Then I saw some graphics code for it (which I disassemb

I knew that Hercules existed but I had never seen one or found any documentation for its graphics mode. Then I saw some graphics code for it (which I disassembled with debug, probably debug.com and not debug.exe!) and stared at it until I had figured out how it worked.

JdeBP 3y ago
See, for one, chapter 10 section 3 of Michael Tischer's _PC System Programming_, published by Abacus in 1990.