| Option Category | # # OSD KEYBOARD MAPPING OPTIONS # |
| Description | This option allows you to set the key that allows you access to the UI when using a system that takes control of your keyboard or mouse. Key codes can be found by opening the UI menu (Tab) and looking in the Input menus. |
| Full Command | -uimodekey <key_code> |
| Alt. Command | -umk |
| Reverse Command | none |
| Example | mame64.exe -spc128 -uimodekey BACKSPACE |
| mame.ini Command | uimodekey |
| Command Default | SCRLOCK |
| Argument Format | <key_code> |