[Moved]

The command is accepted

What command? Inside dosbox?

Yes, the mapperfile option. There is a similar option in the configuration file and the Dosbox command-line appears to accept it. It provides no error messages at least.

The -startmapper parameter or what? Are you trying to remap keys
from the command line or start up the mapper?

Pan wrote:

The command is accepted, but seems to make no difference to the mapping.

Some things seems to be accepted but not be changed,
I discovered while developing a DOSBox front-end...

😲

Correct. I didn't implement all the options in the runtime modification code.
but using a configuration file or using env variables should work

If I get time in the summer, I might give myself a refresher into C/C++ and look at that code 😀 I'd like to make Dosbox more configurable from the command-line. Could be an interesting project 😀