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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 BIO
by hakfoo 2mo 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.
- PerditionC 2mo agodo you have any more info on this posted anywhere? what ISA USB card? Thanks.
- hakfoo 2mo agoThere's a many, many post thread here https://forum.vcfed.org/index.php?threads/isa-usb-board.76978/ https://forum.vcfed.org/index.php?threads/isa-usb-board.7697... where a lot of the discussion took place, both my efforts and some other devs working on a DOS-based driver. https://gitlab.com/hakfoo1/ch37x-bios https://gitlab.com/hakfoo1/ch37x-bios is the actual code. Post 394 shows a picture of the card I used, which at the time was sold in like 500 AliExpress storefronts for about USD25. The magic word is "CH375" or "CH376" (two chips, overlapping functionality, different enough to be annoying to support in software) As mentioned in the thread, it tends to fit a weird niche. For 8086/8088 machines, the other main option is XT-IDE cards, which are like $40+ and they're sort of finicky with some drives. For a 286+, usually installing a standard IDE drive (or a more modern CF->IDE or SD->IDE adapter) is the easy mode with wide software support.