ok, something seems to be wrong. Here is how it should be done, assuming you restart from scratch with the default mappings:
- First, you do *not* want to touch the top boxes mentioning "Mod1", "Mod2" and "Mod3" (with a capital 'M'). These are used for internal DOSBox functions, like loading the mapper and toggling fullscreen on/off. For example, if you change anything regarding the "Mod1" box then hotkey functions like Ctrl+F10 may stop working as expected.
- It should also help if one does not touch any of the "mod" boxes, either.
- More generally, while you may think of keys like Ctrl and Alt as "modifiers" within games, the various "Mod"/"mod" boxes are totally irrelevant. They exist for the internal hotkey functions of DOSBox itself (unless you toggle a lowercase "mod" 'checkbox' on for some binding or so).
- Now, suppose that you want to map Alt+F2 (in the emulated DOS machine) to some joystick button (in the real world). Press on the "ALT" box, then click on "Add" and finally press on the joystick button. Afterwards, repeat this for "F2" box.