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MS-DOS has been Open-Sourced! (www.youtube.com)

submitted 7 months ago by i_have_no_enemies to c/technology

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[–] davidgro 14 points 7 months ago (1 children)

C compilers (at least on personal computers) weren't great at optimization back then and every kilobyte mattered - the user only got 640 of them, going beyond that required jumping through hoops.
Similar for MHz, hand optimization was important for performance since there was so little CPU time to go around.

[–] [email protected] 2 points 7 months ago

And also legacy... If something is already written in assembly and you want to add a feature, you're not going to completely rewrite it.