MSX-DOS2
MSXDOS2 is a disk operating system developed by Microsoft for ASCII Corporation in 1988. It adds several new functionalities over MSXDOS like subdirectories, memory management and environment variables.
This package includes all the files distributed with the official disk now that it's possible to distribute it freely:
mkdir -p package/
mcopy -s -i MSXDOS2E.DSK :: package/
hub install MSXDOS2