It appears that there was a golden age when #DUET existed, during which if one had an old PC98 machine one could blam DUET into (say) an EFI System Partition, mark that as bootable and either using one of the world's many Master Boot Records for MBR-style partitions or my code for EFI partition tables, boot straight into what was mostly #TianoCore and thence in turn into a modern EFI-compatible operating system, via its EFI boot loader.
https://superuser.com/a/619386/38062
But all of the hyperlinks to DUET by Rod Smith et al. have rotted, and DUET has quietly been discontinued, some time in the late 2010s.
So if you have a PC98 machine nowadays, it's either back to fixed-location stages and map files with GRUB et al., or back to the user interface of CP/M with u-boot.



