Doomception: Doom inside Doom inside Doom, and round again
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Ranked by a public rubric, not by votes: what a comment adds counts, not who wrote it. How comments are ranked · Comment rules
Summary
The project runs three copies of Doom 2 on one DOS machine by hand-written scheduling: every four frames it saves the running copy's changed globals, patches and pointers, restores another's, and swaps stacks.