Why I like the FED text editor: 
When I’m not at work on my Linux desktop, you can usually find me writing code for a legacy 16-bit system. FreeDOS is an open source DOS-compatible operating system that you can use to play classic DOS games, run legacy business software, or develop embedded systems. Any program that works on MS-DOS should also run on FreeDOS.
read more: Opensource.com Jim Hall
Supporting Open Source.
Have you tried: Diving with Sharks?