I also did a FAT-12 PC bootsector in 512 bytes:
This code requires that the second stage or kernel or whatever be in the root directory, but it need not be physically contiguous on the disk.
FAT-16 wouldn't be too different, but I agree that a FAT-32 bootloader probably wouldn't fit in 512 bytes.
13 vs 5 instructions for FAT12 vs FAT16 in the code I wrote.
No, I don't think it's even possible, but I haven't tried.
And see no point doing so, either. :-)
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Forgot to mention that I cheated and just copied the first 64k worth of FAT to memory. For FAT12, that handles the split across sectors headache.
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