adding more space to linear executable dos games

[Rufflito]

Originally Posted by dion

Hi,
i am working on an old LE exe dos game, and would like to change some opcodes. the problem is, i need more space on the code segment to make my changes. i have search the internet for tools, but i don't find any. Does anyone know something like that?

Creating code caves is trivial for PEs but if it's for a native DOS app I need to see the executable first (some very old ones impose the 640 kb limit for RAM). Consider posting it?
Or for a start you can do a google search for "code caves" if you didn't already do so.