Before 10 years ago it was used heavily in PC hardware development and testing. Basically DOS as a bootloader that gives you full access to the computer hardwar

Before 10 years ago it was used heavily in PC hardware development and testing. Basically DOS as a bootloader that gives you full access to the computer hardware. Windows had too many things going on in the background to give that control plus the driver development is not so easy. These days Linux seems the answer since you have the source code and can trim it down to the minimal needed for control. I'd have killed for a networking file system for DOS back then. I think we ended up using something like a lap link protocol to transfer files from my development system to the test systems.