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.

[dion]

Yes, i have search for code cave, but nothing for LE file.
The game was compiled with watcom c++ with dos4gw stub. It was mix of 16 and 32 bit program. The program itself is 32 bit, the loader is 16 bit.

For a reason, i would not post the file here, but there seems to be many dos4gw games out there. There is a github that make program to edit LE, but it is not implemented yet. I also see a wiki that have tutorial's title the same with this thread, but it was empty, unfortunately.