I hate to puncture that guy's uphill-both-ways-in-the-snow story, but there were source-level debuggers for at least the NES, SNES, and Genesis (and of course everything after them). Also, he seems to have completely missed out on the fact that a lot of name-brand 80s games were running on script interpreters: the Infocom Z-Machine, Sierra's AGI and SCI, and Lucas's SCUMM.
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