I'm a bit confused, according to the docs:
"dosbox.conf is a configuration file that DOSBox can use globally and/or locally per game (and settings that are left out are taken from the global file)"
https://www.dosbox.com/wiki/Dosbox.conf
But I created a dosbox.cfg, added one variable "mapperfile=mapper-0.74.map" in the local directory and I now have a screeen that is about 1/8th the actual screensize.
When I copy the entire ~/share/system/configs/dosbox.conf to ./dosbox.cfg, it works properly (and uses the local mapperfile.
Need some clarification since this behavior appears to be contradictory. Or did I miss something in the recalbox specific documentation?