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Sectorforth is a 16-bit x86 Forth that fits in a 512-byte boot sector (2020)

(github.com)

Eight primitives and a colon compiler in 512 bytes is a nice demonstration of how much you can bootstrap from almost nothing. The examples building up from there are the best part.
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2020
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Not that impressive considering this uses BIOS routines heavily and whole operating systems including basic interpreter fit in a couple of KiB
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512 bytes is quite a bit less than "a couple of kilobytes"
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It's much better than 512, it fits in 336 bytes iirc.
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