RxDOS is a fast, industrial strength DOS compatible RTOS, supports huge disk drives, FAT32 volumes, Windows 95/98 long filenames, is coded in Assembly language, and is used mostly in embedded systems and similar uses. It is open source, with a GPL license.   
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Sites 3
Dissecting DOS: A Code-Level Look at the DOS Operating System 
                                  
                                  
                                    By Michael Podanoffsky; Addison-Wesley, 1994, ISBN 020162687X, has CD-ROM. Explores DOS structure, function from programmer view, overall architecture, command structure, code-level details of vital actions. [Amazon.com]
                                    
                                  
                                RxDOS 
                                  
                                  
                                    Fast industrial strength DOS compatible RTOS, supports huge disk drives, FAT32 volumes, Windows 95/98 long filenames, coded in Assembly, used mostly in embedded systems and similar uses. [Open Source, GPL]
                                    
                                  
                                RxDOS Downloads 
                                  
                                  
                                    Several Zip format files: readme, bootable MASM files: RxDOS sources, binaries. Another OS: RTX, fast, multithreaded for DOS in C.
                                    
                                  
                                
      Last update: 
            November 12, 2011 at 13:54:33 UTC