You can get even lower! hello world in 512 bytes: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=
And I’m sure even lower, look at all those zeros! and that stupid header
or even better, hello world in also 512 bytes but without an OS!
+r4QfLQOrAjAdATNEOv39EhlbGxvLCBXb3JsZCEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAVao=
So much empty space lol
from https://blog.ghaiklor.com/2017/10/21/how-to-implement-your-own-hello-world-boot-loader/