___  ___ _____  ______ _____ _____  
|  \/  |/  ___| |  _  \  _  /  ___| 
| .  . |\ `--.  | | | | | | \ `--.  
| |\/| | `--. \ | | | | | | |`--. \ 
| |  | |/\__/ / | |/ /\ \_/ /\__/ / 
\_|  |_/\____/  |___/  \___/\____/  
                                   
---------------------------------------

 - Historical MS DOS 1.2 from 1982 boot disk 
 - Binaries from https://github.com/neozeed/MS-DOS/tree/master/v1.25 
 - Base64 decode the dos12.txt file 

base64 -d dos12.txt > dos.img 

 - Then run it with qemu 

qemu-system-i386 -fda dos.img -boot a