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Re:Show HN: KnightOS – An open-source OS for calculators by MaxLeiter on Thursday August 25, 2016 @11:45PM (#12364124)
They don't - KOS currently doesn't have FP support (although the C library[1] does provide FP, it's not too accurate or fast)

[1] https://www.github.com/KnightOS/libc

Re:Show HN: KnightOS – An open-source OS for calculators by qwertyuiop924 on Friday August 26, 2016 @07:33AM (#12365486)
FP?? I was asking about using the calculator as a calculator.

EDIT: Oh, floating point! Now it makes sense!