The trouble is that most SYSes don't bother to set this value - they just copy the whole data area from the old boot sector and replace only the code and OEM ID. So the FF remains there. Verified.
_And_ their boot code reuse this field?
Yes. No DOS boot sector trusts BIOS DL value like us... (Because as I wrote it just can't be trusted very much)
Well, right now I look at boot code of MS-SYS6, and found, that it not uses 24h offset itself
Wrong. The read sector subroutine does use it. See http://www.kzin.com/bootsec/dos5pbra.txt
but pass value from there to kernel.
So the kernel uses it too, thus it's even more important.
I not check what SYS does with original 24h field, but image inside SYS contains 80h value, so I doubt that MS-SYS preserves this field.
That the image in SYS contains 80 doesn't prove nothing. Again, it hurts to be smart when eveyone else is dumb :)
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