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by hakfoo 4 hours ago
I did a lot of work on a custom option ROM for the ISA USB card type you mention. It exposes an INT 13h interface, so systems that access discs through the BIOS will work (DOS, probably CP/M-86 or ELKS, Minix might require you to specify BIOS disc access). More sophisticated operating systems that directly poke the IDE registers are not going to find what they're looking for.