Yes, it’s for emulators, however, 90% emulators dont need write access, they save settings to android’s “registers” or to reserved app cache folder. Maybe author of this rom did bot test it with this kind of emus. I think exagear emus needs write access, others like c64, amiga, ps1,… are fine with read only storage. But, there can be still problem on dosbox side, would be fine find it, I could debug it, but without that device I have no chance. But I can do one thing, I can look in email history and contact guy who tested in the past mdosbox on this device. However it is long time, maybe he sold it