Get Tom's Hardware's best news and in-depth reviews, straight to your inbox. You are now subscribed Your newsletter sign-up was successful DR DOS version 9.0 is now in beta testing, with Revision 291 recently released and available for anyone to download and test. Developer and Redditor CheeseWeezel announced the publicly available milestone as a “complete clean-room reimplementation of DR-DOS from scratch.” The OS is in development mostly to provide DOS enthusiasts and retrocomputing hobbyists “real DR DOS, legally unencumbered.” Digital Research Inc’s DOS, or just DR DOS for short, was originally developed by legendary computing figure Gary Kildall, probably even more famous as the creator of CP/M. It quickly gained a reputation for its technical superiority to rival DOS platforms, supporting more advanced features earlier, offering superior efficiency, and broader compatibility.…