BCC - https://www.ibiblio.org/pub/micro/pc-stuff/freedos/files/distributions/1.2/repos/pkg-html/bcc.html
How to build DOS COM files with GCC - http://nullprogram.com/blog/2014/12/09/
BCC - https://www.ibiblio.org/pub/micro/pc-stuff/freedos/files/distributions/1.2/repos/pkg-html/bcc.html
How to build DOS COM files with GCC - http://nullprogram.com/blog/2014/12/09/
ought to look up dos games that were released as source code
Build Engine
Doom
What else?