Either way, I've already ported dosbox 0.73, but couldn't get the N810 FN keys to work. Then I discovered KC (the Key Compiler) which allows me to create custom keyb.exe layouts: all of the N810 spanish keyboard works this way, including ALL FN keys: digits, quotes, etc.; dead keys (save for ^ which I have no use for), and F1-F10 keys (mapped to Chr+1, Chr+2, etc.) .

Unfortunately some programs completely ignore KEYB.EXE layouts (Windows comes to mind).