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>> Any bit specific for Windows/Unix should 
>> be explicitly turned on by some macro.
> I had to read this a few times until I realised that, in this sentence, bit = part, piece, or component.
>  Not bit = binary digit :-)
> “I know about carry bits, stop bits, and parity bits, but I have never heard of a Windows bit.”
What about half-carry (e.g. in the Z80), used to normalise accumulator
operations to provide BCD format?

[And, just for fun, the Z80 has a 4-bit architecture for the
accumulator when you get to the bare metal, despite the documentation
presenting it as an 8-bit CPU.]

s-b etc.