My classic ThinkPad T43 (from 2005) used IDE/PATA storage. That's slow and unreliable, especially after the PATA->SATA bridge IBM included.
Instead, let's use NVMe SSDs in the ExpressCard/34 slot!
I modified the BIOS to include a custom Option ROM, which can translate the BIOS disk accesses into NVMe.
Windows XP, Debian 12, MS-DOS 6 can boot fine from NVMe!
Option ROM Source:
https://github.com/Manawyrm/nvme-int13h-optionrom
YouTube-Video in Action:
https://www.youtube.com/watch?v=TVKbFLtXLYM